The F303 cam is bad azz, but it's not gonna do what you're looking for.
www.cammotion.com They'll fix you up.
Get a stroker kit from DSS, CHP, or someone reputible. It's cheaper in the long run. Have them balance it for you before they ship it. Lots of guys forget about that, buy all the pieces to build a stroker, then you have to haul it out to a machine shop to get balanced, it ends up costing you more $$$. You're looking at the 28oz imbalance.
Dump the edelbrock, START with a 800 Holley, and you'll probably need bigger than that when it's all said and done. Have a carb shop massage it for you. That pro-form main body is awesome, that's what I was using last year.
You MIGHT want to consider a Super Victor intake, depending on what your heads are gonna flow. Not familiar with the N-351 heads, so I can't really help there.
Like HotRoddin & the Slo-maro muncher said, 550 is very reachable, but you are gonna have to reach in that pocket a little deeper. Just playing with my desktop dyno on the 408 I'm building, it's about 616hp @ 6500. Heck, I even got my "temporary" 347 up to 592HP @ 7000 so it's a very reachable goal.
Just do some research, and remember that an engine is a "system", ALL the parts have to play nice together.
