just put a bigger cam in it, and some bigger headers, and the peaks will climb several hundred RPM......and the numbers should go up too.

my stock 906 headed, TRW piston, 400 cast crank 383 pushed my heap into the 11.20's at 3650lbs with a steel flat hood, and 11-teens at 3550lbs with a six pack hood.

my motor made peak HP around 6200, and peak tq around 4300 with an RPM intake and 1 7/8" headers.

my buddies NHRA stocker Pontiac makes 470-ish hp with heads that are nowhere near as good as 906 heads(they flow like 210cfm @ .425 lift), and he's doing it with a .425 lift hyd cam, and the stock intake and carb.

it was #9 qualifier at the Toyo Nationals a couple weeks ago in Reading, Pa. with a 10.86 (1.08 under the index) at 3450lbs, and actually went a 10.81 on the brakes during eliminations.

i'm just saying 470hp from heads that flow 225-230cfm isnt really all that hard to do.