Building a stroker, advice please

I don't think you'll hit 550 hp with an RPM intake but you might get close. Here is a 427 that I built a few years ago. We made about 520 hp with a small cam and a 650 carb so there was room to make more power. But, if you go with a bigger cam and carb then you start to give up torque on the bottom end so you have to decide where you want the power.

http://www.hotrod.com/how-to/engine/mopp-1106-1968-plymouth-valiant-427-engine-swap/