if it the stock filter it takes the same filter that was used on the v8 chevys. and yes you can get them from napa. i still use the old can and insert filters on my race motors. you can't blow them off or pinch a hole in them. use detergent oil at all times the non stuf is for squirt cans. a 10-40 milti weight would be ok too. been using that in the old john-deers and allis-chambers tractors. rember with the old oils rebuilds were common at 50,000-60,000 mi.
