For the 520-550HP range you DO NOT need anything exotic.

2.10 intake valve... waste of time! Throw that max hp theory out the window, you aren't playing on that field with your HP goal.

A 2.02-2.05-2.08 will feed it fine. Make sure the port is capable.

Don't get caught up in a "theory" build, it will likely be a mess and cost you more money than it should.

Talk to the guy that built the car craft 620hp stroker, IMM. He can sift through the static to get you something that will run well.