Got a 305 that has been rebuilt, punched out .030, has .010-.010 crank with good bearings.  Has a double roller timing chain in it.  Cam lobes look good, bores are excellent, still some cross hatch in them.  The engine was left behind in a garage due to a burned exhaust valve on #1 hole. It has a factory aluminum intake with feed back Q-Jet carb on it, HEI distributor, starter in not so good condition, no water pump or fuel pump.  Comes with valve covers, air cleaner, exhaust manifolds.  Put some good heads on it, plug wires and it's ready to roll!  The heads come with it, but two guides in one head were machined out for testing a hole reamer, so it's bogus now as they went over size.  But for only 300 bucks, how can you go wrong?