RE: Replacement Magnum pro .21 engine
Make sure you have the room for the pull start. The heads on these engines are designed to deflect the air passing through them. There were quite a few older cars that used this type of engine, and some of them had a different layout, so not all engines came with the heads facing the right way for specific applications. The head on the Leo would have to be taken off and turned around 180 degrees to work properly, you want air to enter from the front, then move along the gentle curve of the fins. Without the head facing the right direction, these engines overheat very quickly.