When one ordered the GT package you had to a V8 engine first on the 2 dr T-37. Then and only then was the GT package available. The 350 did not come with the GT option but the GT option was based on first ordering the a V8. Any of them would do up to the the 400 base GTO engine in '70 and the 455 HO in '71. Had to order the endura nose to get the 455HO in '72.
You have to remember the GT option requred separately ordering the V8 first.
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