Great progress, keep going! I tried to get my folks to buy a GA in 74 but they opted for the Cutlass Supreme instead, it was cheaper. GA's are always on my "someday" list.
Anyway, those look like the infamous Sealed Power 411NP pistons, stock replacement & not well liked on this form for good reason. As such, its not likely stroked with those pistons.
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65 Tempest, 400, TH400
86 Fiero SE 2.8
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