The previous photo is very similar to what I fabricated for a couple of engines and they have worked out good. I'd say this is the first piece that needs to be made if your sure you engine is going to be mounted flywheel forward Then you can determine where the engine needs to be located in relation to your lower PTO shaft. If you fabricate one of these adapters be certain to leave the shaft plenty long. You never know when you might want to drive something else off of that shaft.
This is kind of crude but it has worked for me and it is fast. Cut out a cardboard circle ( cereal box) that just fits the flywheel recess. Then take a small ball peen hammer and tap out the bolt holes like making a gasket. This will give you a fairly accurate bolt pattern if done carefully.
If someone has a better option I'm looking forward to hearing it as I think I have another one to do.
Edited by Cvans, February 05, 2014 - 02:24 PM.