At best about 400-420hp and 490-500tq. I have a customer with the exact same set-up, with well ported 6X heads. His car is set up almost identical to mine, converter/drivetrain, weight, tires, etc. It runs 12.80-12.90's at 104-106mph.
My car with a 455, 6X-4 heads (232cfm), Crower 60919 cam, similiar drivetrain components went 12.05 @ 112mph, and made 455.4 hp/538tq on the dyno.
The only significant difference between our engines was the camshaft, same heads, intake, carburetor cfm, headers, converter, gearing and vehicle weight.......Cliff
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https://cliffshighperformance.com/
73 Ventura, SOLD 455, 3740lbs, 11.30's at 120mph, 1977 Pontiac Q-jet, HO intake, HEI, 10" converter, 3.42 gears, DOT's, 7.20's at 96mph and still WAY under the roll bar rule. Best ET to date 7.18 at 97MPH (1/8th mile),
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