Do the blocks have holes for mounts so it can be used in a rwd application like older fwd 3.8s? and would the crank have to be machined to accept a pilot bushing?

Since the 3800 Series II was used in the Chevrolet Camaro and Pontiac Firebird (RWD), I would assume that they are drilled for mounts. These RWD cars, came with both automatic & manual transmissions, so again, I would assume the crank is already machined for the pilot bushing.