'302' Combustion chamber volume?

In the January 09 Popular Hot Rodding issue, they did a write up on Adney Brown's 318 build up for the 07 Engine Masters competition.

He made 477 HP at 6500 (it probably would have made more but they only spin them to 6500 for the competition) and 427 pound feet of torque at 4900. The torque didn't drop below 400 until they were past 6100 RPM. Yhis was done using a set of well-ported former SS iron Magnum R/T heads w/2.02, 1.60's for valves. The block was .030" over with 10.44 comp Diamond domed pistons. The cam was a big Comp solid with 1.7 rocker on the intale and 1.6 on the exhaust.....622"/.597"....247/247 at .050".
It was origianlly a roller hyd factory block. The change to a solid flat tappet is a bolt in. He used a stock 340 forged crank that he worked over quite a bit...balanced and lightened.

You could do a similar build with less cam and get all the power and reliability you are hoping for, but you will need to upgrade the valves and do some decent touchup work on the ports.
He has his own shop.... www.performancecrankshaft.com

P.S. I prefer the shaft mounted rockers over the later model Magnums.