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A mildly stroked 351 would be a more than sufficient powerplant with tons of low end torque, and well into the 400 hp range with similar torque. Probably 450/450 range. Keith Craft could build a nice one for you. I went with a stroked 302 = 331 stroker from KC. 446 flywheel hp at 6000 rpm, and 326 to the rear wheels. Torque range is a little higher than what you would have in the 351. Can't go wrong either way. I had a stock 302 HO motor in my first cobra. Roughly 300 hp, with a low lift cam, and low end torque. Car was very quick accelerating, LOT of low end torque - on a 1.6 mile track with 8 curves cars with over 500 hp couldn't "out accelerate" me. Tweaked that motor - new high flow heads and higher lift cam. Increased HP by 75 - 80, but lost the low end torque, and it was not as quick to accelerate.
HP alone doesn't mean a lot. When do you have it and where is your torque. Generally speaking I believe, even though I love my 331, that a 351 will be a better all around performer on the street and the track primarily due to having more low end torque.
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