I have a 61 and 63 suburban. I gave my son the 63 to restore. He tore it down last year and put engine in the wheel barrow and parked in the shed with a tarp. Well I have not been back to that area in over a year and the roof leaked and tarp blew off and the engine has been underwater for who knows how long but looks like a long time. The engine ran before being removed although not well. Tonight I am going to drain it and fill with ATF or Marvel to let it soak for a few days. My question is after I flush it and get new plug and oil is it best to see if I can get running or do I invest in a rebuild kit and go through the whole engine and carb and just do a full rebuild? Opinions appreciated. Rick