Yes Crown made the most popular kit. No longer available new, but a used setup pops up from time to time. The weak area was the stock Corvair diff that was used. 4 spiders made it better, but still restricted your horsepower potential if you abuse it. Trans (used66-69 Corvair 4 speed) is pretty much the same internally as full size Saginaw.

Dave. I admit to being weird that way. I actually enjoy the design and building process (some say more than driving the finished product ).

Lotsa