Somewhere around here is an excellent article on building a hybrid, and exactly what you have to use. I'll have a better look for it later, as I'm a bit busy at the mo. :D
The engine in my 55 was built in Tassy, so I know bugger all about it. It's a bit Cammy, reasonable porting job and a pair or 40 DCOEs.
The engine for my 25 is really the unknown quantity. Basically it sounds angry. But that project is on the back burner for a bit.
Unfortunately most of my knowledge is in K motors, and I'm just getting the hang of Ts.
As for Solexs, if there isn't a distance record for throwing them, there should be. DCOE's and DHLA's are far better units.
R