I have a 4 bolt 350 bored .030 over with flat top pistons. I'd like to run about 10.5/1 compression and be around 325-350 hp. I just need some help on deciding what heads and cam I should get. I plan on running an Edelbrock performer rpm intake and I already have an edelbrock 750 carb.

 

there are plenty of factors to think about... what cam are you gonna run...as for heads... its all about how much you want to spend... as far as compression goes... that all depends on deck height, compressed head gasket thickness, chamber size, etc... check out this website out and punch in #s to see what you come up w/

http://www.smokemup.com/auto_math/compression_ratio.php

 

I'm running AFRs and they're nice, but keeping them from leaking oil is getting old fast. Their design puts the oil "waterline" above the valve cover gasket...crappy. The car runs like a scared rabbit, but it weeps oil out the gaskets.

I'd go with GM Fast-Burn heads, have a 3-angle valve job and some polishing done on them, and use the Edelbrock Vortec head compatible intake. 62cc chambers should put you in the mid 10.x:1 ratio if you stick with a 0.039" head gasket.

If money is an issue, cast iron Vortec heads modified to take more lift can be had for ~1/2 the price of FastBurns from Wheeler Motorsports. Principal differences are they're iron instead of aluminum, and the spark plugs are straight instead of angled. The intake runners are smaller too.

Compared to the AFR 190 heads, the FastBurn heads have better oil management, make nice power, and flow quite well compared to AFR 190s and similar heads. Good write up:

http://www.sallee-chevrolet.com/Fast...der_Heads.html

 

Strictly by the numbers, the AFRs are among the better-flowing heads. Canfield, Brodix, and Pro Lightning are right in there with similar numbers, but the rest of the aftermarkets are actually behind the GM factory castings in similar port volume designs. The Vortec and Fastburn heads are very good without even touching the ports, and respond well to port and valve work.

Be careful when studying the data on head flows. Most heads are rated in steps from 0.200-0.600" valve lifts. You can usually ignore the higher lift flow ratings, since almost NO streetable camshaft profiles will open the valve to anything above 0.500" for very long. For a true picture of the valve action and the flow specifications you should scrutinize, plot the curve of valve positions over duration for your cam to generate the "area under the curve". Your results should indicate that the valves spend much more time closer to the 0.400" lift range, so flows at that lift point are probably far more significant that the peak flows often quoted at 0.600" lifts.

Of course, cam profiles not intended for street use will have different curves, and the selection would be different, but I'm presuming that this will be in a street-drivable vehicle.

As always, the advertising hype and advertised numbers may not tell the whole story.