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I'm not %100 sure, but with a stock 400 in a heavy 73 Charger with 3.91's, maybe 5.5 or 6 seconds? You'd need decent traction, and probably a higher stall torque converter to get there.

Your goal is doable though I think. Especially if you go the 470 or even a 505 route since it really doesn't cost much more.

Speed cost money, how fast you wanna go?





I'm talking warmed up to about 400 hp.




400HP from a 73 400 is more than warmed up. Warmed up is a header, intake, carb, small hyd cam (less than 230*@.050). 350Hp is more realistic.

The 2.76 gear is fine, IF you have enough motor.