Good places to get proformance parts

Within a month or so I will be rebuilding my 440-6 pack. I was wondering where are some good places to get quality parts. I came across Howards cam. Their website looked pretty good but I have never heard of them. What I like to do is keep my flat top Pistons and my rocker shaft. (If possible). But still get a beefy cam. I also noticed that they sell a cam set. Comes with the cam, lifters, valve springs and the timing gears and chain.

the plans with the truck (it's already been setup for drag racing) but I would still like to take it to car shows and cruise in once in a while.

I'm just gonna throw this out there. How hard would it be to make 600hp

All help is appreciated.
Author: mid-nite09