I think there are a few threads for this here. I looked into going to a 300 on my Chopper last year, and it just wasn't worth it. I've got a Daytec frame, and they had a swingarm that bolted right up, so that was half the battle right there. You're not so lucky with the K9. Beyond that, convert to a chain with a sprotor, modify or refit a new fender, and you may need a different mainshaft on the tranny? Bottom line is, it's cheaper to sell your bike, and buy a custom chopper that already has a 360. Redneck makes a 360 softail frame.