Look at the drivers side bellhousing flange as Bill had mentioned. This is the number that all the reman engine companies look for when determining what type of engine (small block chevy)is currently residing and determines core value on the old engine. Thats how they tell if your buying a 350 and turning in 305 or 267 for a core. Worked in the parts biz for 15 years and PO'd more then my share of scammsters trying to pass off junk cores. My guess it will say 3970010.
