You should be able to find a GT for around 5K, but I don't know if you'll how enough for flow, off-road H-pipe and headers.
1987-1992 Mustangs have factory forged pistons. There are people on this board spraying a 150hp shot. I wouldn't go above that.
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1987 Buick T-type
1998 HD Electra Elide
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