[SD455DJ]

Wow! I see that you have all the RAIV goodies already! I think they would be perfect in a '69 Firebird 400 clone! That combo would be 700 - 800 lbs. lighter than the GP alone in race weight, so 0.7 - 0.8 sec. quicker by weight savings.

Hopefully you have the D-port long branch manifolds for the GP. My brother built and dyno'd a '69 428HO engine (4-speed car) and with 10.5 to 1 compression and a Summit 2801 cam made 425 hp and 500 lb-ft torque, so would move a 4100 lb GP down the quarter mile in the mid-13's with ease.

If I recall correctly, he needed to use flat top pistons (or less dish) to get the compression up with the 62 heads since their chambers cc's at 72 after resurfacing.

Dennis