I have to ask, what are you doing? :unknown: Is there any way you can compare it to a JD deck and its mounting? It is going to be all dependant on mount up and then there is the drive shaft issue. Sorry, I don't know for sure, but good luck with your endeavour. :thumbup1gif:
The only JD650 I was ever next to had a 2cyl diesel motor (Yanmar ?)
And the MMM drove off a clutch and drive shaft from the front of the motor.
Pretty much dedicated to that size motor and frame, regardless of the hood color. I would guess.
That's all I know about that.