Re: new guy from tarpon springs,fl./blazer85
Welcome to the forum. I haven't built a motorized chopper bike but there are quite a few "Chopperologists" on this site.
Chopper builds usually require a little welding or buying a chopper motor mount plate from ebay. You will need to offset the motor to the motor chain side if you have a fat back tire.
Finally, most chopper/stretcher guys run a second chain tensioner or they buy or fab a spring loaded tensioner because the chain is so long.
This stuff is very routine for the chopper guys.
“You're only young once, but you can be immature as long as you like" -Unknown