having the correct compression ratio for FAI fuel is the first step. From my experience most any engine will run just fine IF you take out the head gasket. IIRC you need about a 13:1 ratio. If you have a syringe, fill the head with any liquid. Record the volume. Calculate the cylinder volume and do the math to figure the C.R. Example; Head holds 1cc. Cylinder figures out to 10cc, you have a 10:1 C.R.

Ken