I have a 1965 Christ craft 17 ft utility boat the needs a engine, it had a 283-H #837562, motor in it but the heads went bad, I have a chance to buy a runny 283, 188 hp motor it has a tag on it that says it's a Gray Marine, 188 hp, ser #T4413 on it. The guy says it's a GM, I looked at the pictures of it and it looks right. Is it?? you can reach me at esmith14886@netzero.com. Thanks es