Hey Crazy, sorry no head but in the same boat as you. I was building a L28 for a turbo and got a P90 and scrapped my N47. Well, things changed and I decided to go with a Arizona Z 4BBL intake and am now installing a MSA stage three cam (460 lift 270/280 dur.). The only difference is the P/O installed flat tops in my engine, so that's what I have be running. Now I have herd both ways, that a P90 is the best flowing head you can get, but then when I talk about my build I have had people tell me I have a crappy (literally) build. I ran the engine with the stock cam, and it ran pretty good. Not a beast by any means, but pulled up through the gears good. I just don't think the stock cam had the duration to maximize the benefits of the P90 head. I would think with a cam designed to pull up to 6500 RPM and a good flowing large chambered head you should be pretty set up for success. Right or wrong, I'm not sure, but I will tell you, you can run it.