I looked back and I said a 80's Caddy. I meant 70's. Look for a mid 70's Cad. Like Pat said, to build the Cad it will cost more money but then again they are sweet engines and something a bit different. If you go through the trouble of building the whole motor, etc then why not just buy a crate motor? The 502 is something to look at even thought it's like 12,000 bucks but still it's a complete BRAND NEW block, everything.
Tech, the 472 and 500 is the same motor just different stroke am I right?