Are you doing it twice? (joke at double post).
Its too hard, and it wont be good for weight distrobution.
Get a MA61, put a 7M in that, its all bolt in (not that ive done it, but heaps on this forum has).
You CAN use the RA65 box, its a W55 or W57? either will bolt to a M engine with the right bell housing. But the ratio's arnt suitable, so W58 is a better idea, it will bolt in.
Mounts will all have to be fab'ed for a RA65 and you'll need thermo fans if not radiator moved forward.
Still, MA61 definately better idea.
IMHO, MA61 = M or JZ
RA65 (SA63) = 3S
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