Pretty aggressive and impressive outing for a youngster. Considering the legal drinking age is 21, you've got a few years before you bodge things up due to that (assuming you are a good law abiding Southern man).
You've also got some great members in close proximity to assist if things get hairy. MurrayF, Phil in Lowgap, and several others.
Great platform bike, I hope you can keep the thing structurally able to handle the powerplant. It's got some poop to it.
Joel in the Couve
P.S. you didn't state if you are sure it runs right. That should always be the first thing to get after, then deal with modifications.
The WIKI has a factory service manual you can download free. Before you get too deep, get the powerplant and associated items right. I have a link below.