Hey Brew,
I talked to Dan about your dyno pulls and he was very pleased with how your stock '72 455HO numbered with the factory exhaust manifolds with only the 2-1/8" outlets, so there is definitely 10-15 more hp and torque to be found if you substituted new Ram Air Repro manifolds with the 2.45" outlets and possibly a different Q-jet carb. Even if you leave it as is 400 hp and 500 lbft of torque over a long rpm range is amazing.
Congrats & Cheers! Dennis
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