Hey Dave, thanks I was very, very pleased with the results. Though I have built engines in the past this is the first time I did all the work (including all the machining) myself. The cam is a Comp Cams extreme energy hydraulic roller cam. 230/236 duration .510/.520 lift. Also I'm using 1.6 roller rockers. The engine will be installed in a '74 Corvette coupe. I think the key to the numbers are in the heads. I used the AFR 195 Eliminator heads. These units flowed 277 cfm @ .600 intake and a huge 223 cfm exhaust.