Brazilton KS | If you know the gear ratio, tire size, and engine rpm when it ran out of power, you can calculate it. I don't know about a T/A, but a '77 z-28 automatic had 3.42s. With 26" tires, that makes about 2600 engine revs per mile, so to get to 120 mph requires 5300 rpm, which was more then I had hp to get to stock. Later, it would go to whatever you wanted to rev it to. I would not rev a cast crank to the rpm required to get to 138.
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