Cool! I have a raptor motor with allllll kinda goodies inside, makes about 15h on methanol with aTillotson Carb...but it is honestly wayyyy too much for my wards frame, and I even put extra gussets on my frame. Its mostly the jack shaft that won't take it...it flexes like crazy. My advice is to box the jack shaft Mount heavily so it can't flex.
Get a good motorcycle style disc brake.
Don't use much rake on the front wheel or it will get very scary at about 55, 60.
Come to Denver, I'm just crazy though to test it...I had to test mine minus brakes (had too).lol