My 468 will be going on the dyno in a few days. Boodlefoof was kind enought to run a desk top for me but I'm not sure I gave him enough information and I wasn't sure of the head flow.
Anyway, 60 over 454, GM aluminum oval ports, 225 int. 188 ex. 290 cc intake runner. XE284H Comp Cams 240 @ 50 int. and 246 @ 50 ex. on a 108. Weisco 9.4 to 1 forged pistons (heads cut .030" to make compression), Edelbrock Performer RPM intake, 750 CFM carb, polished stock crank and ARP main studs, 1 7/8" headers into a 3" collector.
Guessing at the intake flow, the desk top said 463 HP at 5500 RPM and around 490 lbs I think.
My engine man said 520 HP at 6000 based on other engines he has built.
We'll see this week. I'll post the dyno results at weeks end.