Most Pontiacs in Canada had chevy motors from 1955. Some of the newer ones that he is talking about had oddball 350's that weren't small block chev. I am not a muscle car guy so can't help you out there. Also we never had wide track Pontiacs as ours only had chev rearends. We did have Pontiac performance cars though with big block chevs. 62 bubbletop Pontiacs with 409's. Pontiacs with 427's and 454's as well. Our 57's had 283's although I am not sure if fuel injection was available.