What year is your 350 Chevy engine 3970010?

Could be a,

1968 327ci, 2 bolt main

or

1969 to 1979 350ci, 2 or 4 bolt main, from a car, truck or Vette.

Re-post question with the engine code stamped numbers on the machined pad in front of the passenger side cylinder head. This code will help us give you more specific info.