If the shift indicator on the steering column has a "2" in it, you have a TH350. If it has a "S" in it, it's aTH400. (I think, but don't hold me to that!)
BOP stands for Buick/Olds/Pontiac.
A chevy TH350 will NOT bolt straight in.
Posi was available for any engine/carb/trans/rear gear combination.
