imo you can build the 7m gte to your goal easily enough just as a 2jz. in the long run i belive it would be cheaper if you already have a 7m motor lyeing around instead of going and buying a 2j then having to build it up. in the reliability deparment i belive toyota has never made a bad (unreliabl motor) so i belive if you where to build your 7m correctly not in a rush and whith the right knoladge it shouldent give you any problems(if you beat it to hell and dont maintenece it thats on you, even toyota cant do everything)
from what i have read i belive 89 and up had the motor mounts made for the 1jz whith will luckily bolt a 2j perfictly, like my 87 wont line up or even work, for electronics if your swaping a newly rebuilt motor you should have the factory wireing harness whith you.
you got my 2 cents but im no expert i would think it would be cheaper to build your 7m since you would already have it vs trying to find a not abused 2j and fiddleing whith swap and build when whith your 7m its just build
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1987 7m-gte R-154, SS braided clutch line, full 3in exshaust,aluminum radiator,full throttle gen 2 whith GM 3 inch mass air flow,13lbs flywheel, and more to come
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