If you are going to add goodies, then you may as well get some nice flat top pistons and get some earlier heads with smaller chambers if you are looking for compression.
I would guess you have about 9:1 with either engine you have stock. You can still make plenty of power with even that much compression. When you start reaching 10:1 and higher compression you start needing octane boosters to run on pump gasoline.
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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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