Not to down on your project, it's cool, but your gonna have to gusset THE LITERAL **** outta that frame and swinger. You'll bend and twist one or the other or both. It will be awesome when its done though.
That will be a sweet project. I don't know the transmission gearing so I can't really help with the sprocket gearing... But you can base it off other sport bike engine swap bikes here.
I don't what kind of riding your doing but I've owned few quads with street bike engines and its hard to trail ride them because the HP is so hi in the Rpms, have to gear them way down other wise they bog down. Also depends on the motor too. I have a 16t and 52t to get my radian warrior to ride the trails.