Is the Chevy 350 block the same as the 327 block?

The 327, is a 4 inch bore, but, it is a small journal motor, so no. However, in 66, and 67, Chevy made the L72, which is better known as the 350hp, 327. Vettes, and various other hot rod packages, in the Nova, Chevelle, Elcamino could be gotten with this motor, 2 years only. Being high performance/heavy duty, they made this motor with a large journal, which is what a 350, is. So, this one, specific 327, 4 bolt main, large journal, yes.