came from a 76 z-28, 350 2 bolt main, never bored, stamped 3970010, also has 010 020 where timing chain would go, haven't done anything to it, has the crappy heads to go with and distributor, 1 q-jet carb and the original 2 barrel, missing only camshaft. carb to oil pan minus exhaust manifolds, i prefer not to part, come get the whole package 100$ negotiable