Best bet would be to swap everything over that bolts onto the engine, as there will be several differences....
The fact that you have different mounts tells me that your engine came from either a 89 or later Supra or a 89 or later Cressida, both of them having a slightly lower redline due to changes in balancing the rotating assembly. You may want to look into getting the proper ECU, although your 86 ECU should be able to work fine. Just be mindful of the lower redline, and take care of routing all of the vacuum lines properly before you install the engine, as this will be extremely difficult if you wait till it's in.
That's all that I can think of at the moment, just swap everything external over.
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1989 7MGTE R154 Targa Top White Package w/Blue Interior
Driftmotion 57trim CT26, Upgraded Intercooler, 2.25" Hard Pipes, 3" Turbo Back Exhaust with Test Pipe, HKS VPC w/GM 3 bar MAP sensor, APEXi S-AFC, Walbro 255lph fuel pump, ProSport EVO Series Boost / Fuel Pressure / AFR gauges, Lotek a Pillar Gauge Pod, HKS Type 0 Turbo Timer, Eibach Lowering Springs, Tokico Illumina II TEMS struts, custom powder coated Motegi Racing TrakLite wheels
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