For those who might be interested, I just completed a C3 brake upgrade on my 67 Grande Parisienne. 

I used;

69-82 C3 spindles and hubs. Ebay items.

69-82 C3 caliper brackets. Ebay and Repop.

Wilwood D8-4 Calipers. Kit included braided lines/adapters, pads and hardware. Summit.

Russell speed bleeder screws, 1/4-28. Summit.

Parts store rotors. Pattern Dimple drilled and zinc plated by my brother.

Generic Corvette supply splash shields. Offshore. Cheap.

Parts supply C3 1 1/8 " bore master. Generic rebuild. Shallow hole.

SSBC adjustable proportioning valve. Summit.

Wilwood 10LB residual valve. Inline with rear system. Needed with drums on a Disc/Disc master. Summit.

1969 Impala drum brake steering arms. 67-70 will work with the stock Impala tie rods. 

Used the stock power brake booster (11"?) already in car. Saved some work installing the shiny one I have. 

Grade 9 fasteners to mount the caliper bracket and steering arms. Local bolt supply.

Worthy of note;

Spent some time shimming the rotors to the hub, improved the runout some, but to tell you the truth, I'd say it doesn't seem to matter with these Wilwood calipers. I can't feel any pulsing so far. Used new grade 9 bolts on the brackets and arms. All new bearings/seals/caps in the hubs. Homemade splash shield gasket from cork/neoprene sheet.

Used one OEM caliper bracket, the other is a offshore repop. Went through quite a few before I found two that were fairly straight. The straighter they are, the more parallel the calipers will sit in relation to the rotor. Shimming can help here if req. Built 2 rigs to mount the spindles in while building them up. It made it so much easier.

The spindles were ebay items, and came with the vendor promising they were undamaged. Good threads, no ridges on the race surfaces, and no enlarged ball joint stud holes. They were good. They are all over ebay now.

Steering arms were from a 1969 Impala Drum car. 67-70 Drum arms can be used. Direct bolt up here.

Added the 10LB residual valve in line to the rear brakes (keeps the shoes out at the drum), placed it after the master. Still have rear drums (possibly change to disc next year). You'll need the residual as the Disc/Disc master does not have it built in. I could have just bought a Disc/Drum master but that would have been too easy! Added a SSBC adjustable proportioning valve in line after the residual valve. Mounted it on a bracket that bolts to a booster stud. Made my own lines...and none leaked! Carefully measured, made and dry fitted all the lines and valves before taking it all apart and bench bleeding the master. Got the air out fairly quickly. No real issues here. 

Original master was the deep hole style. New master was shallow. Carefully measured, cut and ground the end of the long pushrod to work with the shallow master. Made absolutely certain there was a slight clearance, and that it was not pushing on the piston when the master was bolted up. This is very critical. Any piston pre load may build system pressure and cause the brakes to lock.

Bleeding the system was a snap for the most part. Thinking ahead, I installed Russell speed bleeders in the top two bleed screws on each caliper. Used new DOT3 fluid. Left the proportioning valve full open to the rear when bleeding. The rear drums are working well. Pedal feel is absolutely perfect! The Wilwood D8-4 calipers are sweet. Imop, spend the extra $200, don't bother with the stock iron 4 piston calipers.

The end result was, after gently seating the pads, unreal braking right from the get go! A huge difference! I have not even closed down or adjusted the rear proportioning valve yet. The car stops true and straight with no rear lockup. As most of you know, I'm also now running all global west front arms/struts and a big Addco bar, Edelbrock AIS shocks, so that does play a big role in the tracking under heavy braking. I also have installed a AGR 12.7:1 steering box (AGR 492117), which works perfectly right off the shelf.

Cheers, Mark

Bottom line is, as an upgrade on the 65-70 Canadian B Body, a well thought out, pieced together C3 setup with the Wilwood D8-4's will work fantastic first time. And even better... everything is easily available to make it happen! It's all future upgradable to bigger also, Calipers, rotors, hubs, etc. Although the drums worked reasonably well, stopping confidently and with authority really brings a new modern dimension to the 67.

Funny how small the 11.75" rotors look in a 17" rim.

Gratuitous shot, taken tonight at Casablanca....