big block stroker build

Was going to build a small block stroker but what's better than that?? A big block stroker of course. LOL. Would a 451 or 505 be better for a guy with a modest budget?? What kind of money am I looking at? What I'm looking for is a powerful engine with streetability. Just thought a bb stroker would let me accomplish that easier. Has to whip the **** out of my son's 80 Camaro (3300 lbs) with 530 horsepower. Doesn't have to be stupid power, 500-525 horse would be a nice goal. It's going in a 67 Barracuda so it's going to have a great weight to horsepower ratio. Finding a 440 or 400 block doesn't look to be a big problem. I was looking on 440 source and they look to have pretty much anything you'd need to build a bb stroker. What kind of quality are their parts?? Their stroker kit and Stealth heads with roller rockers would run about $3700-$3800. Assume about $1000 for a prepped block. Another $1200-$1500 for a cam and induction set up. I'm at $6000-$6500. Am I in the ballpark? How much more $$$ do I need??