Think about this: The largest production engine in an American car was the cadillac 500. It ran just fine with a small cam and Quadrajet.

You have decent compression and the aluminum heads, I believe you need a smaller cam like the Comp XE275HL and matching lifters and springs. That's all.

For an intake any intake that fits under the hood will be OK. I'd use something like a Torker 440 and a Holley 3310 750 cfm.

Back in the day like 1974 there was a favorite Hot Rod article "440 to 514 for $750". The guy ended up running it on the street with a Holley 6619, that's a 600 vac secondary. He might have been running an SSH-25 racer brown, just to illustrate how old that cam is. Shoot, the MP 509 cam would work in that engine on the street, there's probably a dozen of them floating around.

R.