The engines that I have looked at all have the side mounts near the front, as pointed out by John1 (thanks!). With regards to the automatic blocks needing to have a pilot bushing installed, is this simply a matter of pressing a bushing into an existing hole, or will I have to have the hole machined into place? The engines that I have access to are in other towns, so I can't look them over right now. Thanks for the heads-up on that issue, Longbox55.