It's a heck of a job, but if the rot hasn't travelled too far up into the dash and down into the cowl and you still have the meat to attach to, you can just piece and weld new sections back in. I did it on my 65 B.

Just the one thing to be considerate of, is you must follow the same positioning and shape of the channel all the way across. The glass absolutely must sit in the factory position for the reveal molding to fit properly. The sealing system you use and the rubber shims buy you some leeway, but not much.

The one good thing is that the appearance of the work matters not. Just that it's strong, seals well and is long lasting. It all gets covered up anyway. I have images of the repair if you'd like.

You guys are lucky..

Is that the one that is the entire cowl? Down to the firewall seam.

Never knew they were available. Got a link?

Ok, I've see those fabbed channel sections. But never anything all the way across the front for a B, unless the entire wiper cowl.

cdnpont wrote:

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Ok, I've see those fabbed channel sections. But never anything all the way across the front for a B, unless the entire wiper cowl.

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 that I have not seen either

4SPEED427 wrote:

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 how much are they Carl?

Thank you Mark, Kevin.

I will be receiving a Dash Panel Patch from AMD next week. If anything we might be able to use it in the repairs. But the fitting I learned is not exact. Nor is there enough metal to patch the rot which has migrated further up the dash (the cowl is fine).

I came across the new replacement cowl sections during my search Carl. The issue is the dash overlaps the cowl, at the windshield channel, so that piece is of no use. 
The body tech is almost ready to commit some extensive time/labour in fabrication, as we have almost exhausted our search. 
Desert Valley Auto Parts in Arizona, and GM Sport Salvage in California are two sources of used, rust free, cowl and dash section  with the windshield channel intact (still welded to the cowl). Problem is, $550 US + a whole ton of shipping. But this might be a good thing because a whole ton of labour could be saved.

Here are a couple pics- the part ill receive next week, and the cowl section I could bring up from the deep south (The used part is for a different car, but Desert Valley can supply the 68 GTO similar piece)

https://m.youtube.com/watch?v=DGWX8J2BaQY

i got one for my gto from rpm parts in saskatoon

We are looking for good results in this repair. Do not want this kind of damage happening again. I know the repair will be mostly buried. But I do not want any worries down the road. Here is a pic of what the rot looks like

My 68 is stripped to the cowl and the windshield is removed so if you need any reference pics let me know.