Guess I should mention this is a small block.
If I understand it correctly, in 1968, real early vehicles may not have any VIN stampings on the eng/transmissions. Then they began stamping them on the top of the bell housing mounting flanges(except for the 4 speeds) then as production progressed they were stamped on the passenger sides of both the engine and transmission. Is this correct?

Karma has no menu. You get served what you deserve.