From my cursory glances on the Cressida forums, there have been a few threads there about this. Searching there would be my first port of call.
GS300 2JZGE will have the right sump. A lot of 1JZGEs have front sumps, presumably from the lower spec MarkII in Japan. The auto will be the same but there may be differences in some of the speed sensors depending on whether your car or the donor car has ABS (hard to talk specifics).
I'd imagine you would need JZX81 mounts.
Some people have talked about using the 7M loom and ECU, but your best result will come from using the 2JZ loom and ECU. There will be a myriad subtle differences between the 7M and 2JZ looms such that, whilst you could do it, it would probably be easier to just splice the 2JZ loom into the MX83 loom. Mind you, this is coming from a guy who has never done that conversion.
From memory, with a 2JZGTE conversion some component of the motor fouls with the brake booster. The GE is much less bulky out the back there, but just check on the Cressida forums to make sure this isn't an issue with the NA motor.
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