500 very streetable/pumpgas hp (the sort you want) is pretty easy to do. But what you really NEED is 500ft/lbs of torque from about 2000rpm up.

The Summit catalogue has top end kits - alloy heads, hydraulic cams, intake & gaskets etc from Edelbrock and from Brodix, so you can get a well matched set with them having done the thinking and R&D for you.

The other way to get good torque is to max out the size of the engine. So go get a stroker kit. The Edelbrock 502 kit advertises 611hp with a hydraulic
roller package.

One mans budget is another mans excess, but I reckon those Edelbrock kits are the way forward.

Down here, we are trying to get 850 streetable/pumpgas HP from a 540 Chev with a 671 on it, all for less than US$7,000. We are using a lot of second hand parts & reckon buying new it would go close to US$20,000.

So there are ways to avoid killing your budget. Just takes a bit longer to get there.