I have a '62 Cadillac with the original 390 v8 caddy engine. I removed the engine along with everything else since I'm doing full resto. My question is, should I stay with the original engine or go with the popular 500 engine? The 390 is in excellent condition with sweet compression but it seems like it's hard as hell to get the upgrades for it such as a new exhaust and intake manifolds and everything else but everyone seems to have the upgrades available for the 500 engine. I checked out Edelbrock but they didn't have anything listed for the 390. Should I stay og or go for the more popular and parts ready 500? Thx for any input.