The t4 will last till the first accidental side step of the clutch or if you baby it will last a few hundred miles.
They are about the last trans I'd put behind a torquey v8.

Pukejo or a T5 are just as bad.

Tiny webber on a 360? Not so much.
MC2300 2bbl minimum, new intake and q jet or better EFI.

Call Mitch at RMH he builds and ships t18 trannies anywhere, best prices and lifetime warranty.303-808-1268

SD