the cad 500 has the BOP bolt pattern (buick,olds,ponitac)so it should bolt to your old bellhousing but I am not sure if you can reuse the drive shaft exhaust pattern is close to a big block chevy so you have to cut off some chevy headers and weld the cad flange on it.also take a look @ this web site lots of info
http://www.cad500parts.com/