How much beefing up do you plan on doing?
If you are worried about the frame holding up you can always buy 4 or 6 point roll cage.
I have a mild 351W in my 82GT, and that has T-tops with just subframes and I see no problems yet.
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'82 GT 351W C-4,BBK headers,Carter 625 carb,Comp.Cam,Flowmaster exhaust.
1988 GT...T-5,bone stock
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