451 Build For the 67 JC B'Cuda

A 470 doesn't have any rod ratio issues and it doesn't require a super short piston. There is plenty of room for a good ring pack and all of the parts are off the shelf. 440 Source usually has a 470 package or you can buy the crank and rods from Molnar and then get pistons from various places. The piston is a very important part of the build. You need to have close to zero deck for the quench, but you'll need some dish volume in order to run on pump gas. There might not be a stock piston that solves the equation for you but custom pistons don't have to cost a bunch. Diamond will do one custom feature on a piston for just a slight charge.

I don't think you need a roller cam to do what you want. A fairly mild solid flat tappet cam will give you 550 hp with a pump gas 470 engine. Take a look at my old 466 engine that I built with Edelbrock RPM heads (unported) and cast iron HP exhaust manifolds. I used a Mopar 0.528 solid flat tappet cam in that engine and it made right around 550 hp on the dyno. In my '65 Coronet it made 475 hp at the rear wheels. That was with a Performer RPM intake manifold and a 800 cfm Edelbrock carb. That would be a very eash combo to replicate and it wouldn't cost much. The Trick Flow heads are better than the Edelbrock heads so you'll have a better engine than what I had. I wouldn't be afraid to run the MP .528 in an engine like you are describing or I might go with a new cam design from Hughes or Comp. Using a flat tappet cam will save you at least $500 if not more. You won't need the expensive lifters or the cam button. The valve springs will also cost less and you can get buy with a less expensive pushrod.