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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.
Was going to add aluminum heads to the combo you mentioned maybe that's not considered warmed up, but would the combo you mentioned plus aluminum heads get me closer to 400 hp?
1973 Dodge Charger SE 400 automatic transmission. Curb weight: 3800 lbs. All stock so far.
Goal: Reliable everday driveable warmed up 400 as close to 400hp as possible, then a 470 stroker if need be.
Don't protect a feminist when the collapse comes!
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