I think putting a Saito on a SPAD is like putting super-charger on a Yugo. Go and get a Magnum .70 or anything comparable, used. Magnums are good engines. I have 2 of them. my little magnum .46 2-stroke has 10 gallons through it and it runs perfectly. Still starts with one flip too.

Look in the classifieds on RCU for a used engine, try e-bay or ask around at your club. Don't go putting a $400 engine in a $10 plane. Just get something that runs well at low cost, (i.e Magnum).

Good Luck!!