How much horsepower to expect?

[hertelbr]

All right all you gear heads and knuckle busters. I need some expert advice and I am sure some of you out there can give me some good advice. I have an '03 shell valley with a cleavor engine (351w block, 351c-2 valve heads.) I had it chassis dynoed. It showed 251 hp at 5000 rpm as its best pull and then started to fall off. I was a little dissappointed with the results. It seems everybody I talk to says that the cleavor is a good set up, they say that it builds its horsepower at high rpm's. It makes me think the engine is working against itself. I have a 444552 crane cam (this is what was recommended), the lift at the valve is 502/520, min rpm is 3000 max is 6000.The duration etc. I don't completely understand. I have a t-5 trans. 3.90 gears, ford 9, 4 link sus. It has stock rods, crank, and Keith Black flat top pistons, the block is bored a standard .030 over. The pistons have valve reliefs in the corner. Am I building enough compression? What horsepower should I be seeing out of this set up with the right cam etc.?

What are my best upgrades for better performance? I have thought about a Coast High Performance 427 stroker kit, but that means new aluminum heads, intake manifold, headers, stroker kit etc. about $ 5000.00 by the time I'm done. Would I be better to supercharge what I have? Any suggestions and comments would be helpful and appreciated.