The delima your having is easy to solve! You'll need to be able to adjust both engine to jackshaft and jackshaft to axle. I use a basic slot 3/8" x 2"-2-1/2" long for both. That length allows for 3 chain lengths in #520/530. It appears the motor would move towards the rear and the jackshaft would move towards the cockpit- so find where you'd like it to be based off your belt. Mark the frame rails for the pillow bearings (jackshaft) and where the engine plate would be bolted to. Movement of the parts are away from each other. I'm assuming you have a stock belt? If you don't I can give you a link to the cheapest belts I could find.
Any of this making sense?
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