Heck I honestly dunno anything about the pulleys or anything. Maybe you can educate me on that. But the engine itself is actually a WT code out of a 1970 Firebird 400 4 speed. So it has 11 bolt water pump/timing cover setup, etc. Maybe the pulley setup all came out of that car? It's a Frankencar made out of all kinds of stuff that came with it when I bought it as a botched project back around 2000. TH350 of unknown origin, posi 3.08 rear out of a 1974 Nova, Qjet carb off a smog era 1977 GMC pickup truck (but recently treated to a comprehensive Cliff Ruggles rebuild/modification where I followed his book and spent about 20+ hours doing the carb...), Camaro quarters with Fbird gills grafted in, seats from Chrysler Sebring, trans cooler and starter solenoid from Ford van...I could go on for a LOOONNNG time here...

I think the instrument panel might be original to the car...not much else LOL.