Will need to make up engine mounts.
FWD and RWD engine is same block, so RWD mounts will be fine (but wont bolt to RA60).
T-Series is fine, bellhousing for a 4A - W is hard to get so i wouldnt bother.
Different wiring loom is small port, big port and 20v, FWD/RWD doesnt matter.
20v are expensive and harder to setup.
I think you should know that RWD 4ages are expensive and converting a FWD motor is a far bit of work, ignition, water pump, intake manifold, exhaust, accessories, and more all needs to be changed to RWD vr.
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