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I would unbolt the plates from the back of the motor, position the box so the short primary case can be used - then make a setof rear engine plates to suit. Imagineering how to do it might be more difficult than actually doing it. My brother built an 880 JAP motor into a Velocette frame. When he was installing the gearbox, his mate said 'that will never go in there'. Then he watched as my brother lowered the box and rotated one engine plate at the same time. It fitted perfectly.The tightest engine swap which I have done , was a Triumph 650 engine and gearbox into a BSA A10 frame with full circle rear engine plates - worked well.
I would unbolt the plates from the back of the motor, position the box so the short primary case can be used - then make a setof rear engine plates to suit. Imagineering how to do it might be more difficult than actually doing it. My brother built an 880 JAP motor into a Velocette frame. When he was installing the gearbox, his mate said 'that will never go in there'. Then he watched as my brother lowered the box and rotated one engine plate at the same time. It fitted perfectly.
The tightest engine swap which I have done , was a Triumph 650 engine and gearbox into a BSA A10 frame with full circle rear engine plates - worked well.