73 t/a stock is nothing. By that time, they were 8.4:1 compression with tiny cams, small carbs, and crappy heads. If he's stock, he's under the 300hp mark with a motor in good condition. And those cars weigh around 3300-3400lbs. You'll have no problem. Now go show him some mustang taillights!
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Neal
69 stang
351C/4sp
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