It depends on where it sat and how long. If it was in a cold climate and sat unheated for more than a couple years I would pull the heads to be on the safe side.Cylinders have a tendency to get rust rings and if they are bad enough,they can snap a piston ring easily.
I know the first impulse is to get it to fire but I have seen many motors that have sat for years and they were fired up,,only to have a piston seize,,or start puking oil. Intake/head gasgets are cheap and when you have the heads off ,you can really see what you are dealing with. JMO
Do whats been said and also once you get it to turn over, make sure you have fresh oil in it and turn it over without firing at least until you have oil pressure. You can do an IV setup for the gas with a jug and some gas line running to the carb.
A forum community dedicated to 1955, 1956, and 1957 Chevy owners and enthusiasts. Come join the discussion about restoration, engine swaps, reviews, performance, modifications, classifieds, troubleshooting, maintenance, and more! Open to all models including Belair, 210, 150, Sedans, and Nomads.