This is the easiest and probably the cheapest way. Smaller A Body rotors, but it uses your stock spindles. Less pulling the front end apart.

CPP

The other option is to put together a 69-70 single piston setup. Hard to find the individual parts for. But the Single piston calipers are reliable and very cheap

Or piece together a C3 corvette 4 pistion caliper setup. All parts are available ebay or parts houses. Pricey.

Thanks Carl i'll look into it.  By the way that is a nice car you have.  Where did you find that one?