The Trans Am turbo is larger & I would say it will give you more turbo lag especially w/only a 235 CI engine.
The Pontiac turbo is larger than the 3.8 turbo, the carb adaptor/manifold is also different.
They would be in different positions if were to bolt them up on a manifold, not a lot, but there are differences.
I would say the 3.8 Buick regal turbo would be closer to what you are looking for as far as performance & boost limit.
Years made about 1978 -1982 ish.
They also had the same set-up on some Monte carlos of the same era.
Try & get a complete set-up along w/a carb if possible.
Reclocking is just loosening the compressor cover bolts to the center cartridge & repositioning the compressor cover.
MBHD
