Make sure you check inside the intake manifold for presence of oil. If it's in there, you have much work to do before the swap. There is a steel pan on the bottom of the intake, and the gasket between ALWAYS fails. You will need to get a kit from Hughs engines that fixes this problem. The problem is that the gasket fails, sucks engine oil, carbons the valves and pistons as well as inside the engine. Said carbon accumulation can plug pick up screen. Ask me how I know...