It's your car, do with it as you please. If you want a 3.55 rear in it, put it in. You want tri-power? Go for it. Want a different grill -- do it.
I think the line is crossed when such a car then is sold, say on e-bay, as a "Tri-power GTO" -- only to read further that it is a Tempest.
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'67 Lemans Sprint OHC-6, MT, Mariner turquoise/turquoise.
'77 Formula W72
SOLD: '69 Executive, 428/360hp, TH400, 3.08 Safe-T-Track, midnight green
SOLD: '67 Tempest 326, Mariner turquoise/turquoise
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