When adding that kind of HP you'll need to brace and beef up everything as the stock chassis and suspension wasn't designed for it.
Mounting that engine will require a substantial swingarm modification with a means to adjust the chain or a chain tensioner. Your motorcycle shocks may or may not be enough for the near 200 LB engine (GY6 around 60Lbs)
Your shifter is pretty simple- buy a shifter cable and buy or make a lever that moves forward and backwards.
Your clutch- depends on if it's cable or hydraulic on how you want to set that up, either a grip lever on the shifter or add a pedal.
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