I'm using a Power Master with my T/A race headers, I tried others that are smaller that didn't work.
The Powermaster "clocks" continously so you can orient it in any direction, most others can only "clock" where the holes or slots are. The Power Master uses a clamping system instead of holes or slots. Leave the clamp loose, rotate it any way you want, clamp it down and you're done. The ones with different holes you have to remove the starter, remove the bolts, re index and reinstall, until you find the one position that works. That's too much trouble for me, and I have a lift!
The PM also comes with the QA test result card verifying amp draw for that unit!
That speaks of quality and attention to detail!
Oh yeah, the Buick also takes any Chevy V-8 starter, so that makes your selection process easy!
TIMINATOR