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An 86 body is usually coil spring not torsion bar rear unless it is a ute, or did the hatch also get an extended production ? Wherever you may be that got ea71 in 86, your engine may be step or two behind but surely and 86 Gen3 body will not take Gen2 rear suspension without a fight

If there are no vac leaks, and everything else is good, then in this case it may be warranted to adjust the idle stop screw. The Throttle body (TB) was designed for a 2.2 Now you are running 2.5 liters of displacement if I'm understanding. it's a small 6mm locknut, with a tiny 3mm? allen on the screw to adjust the stop. Some have an 8mm locknut and a screw.......depends on what exact intake you have. It's on TB with a little orange or yellow paint on it. It is generally NOT a good idea to mess with that screw, but in the case of this frankenmotor it's probably your best bet for drivability. 1/4 turn or less should do it. TPS idle switch contact may need reset/adjusted after changing idle stop screw.

What was the CEL? A scanner may show it as a 'pending' CEL.

Trans isn't that hard...search on here/online for info. All Subarus of that era will be similar. Also, that H6 is known to wear out the timing guides/tensioners. They'd be suspect @ 260K.....and that job doesn't look like fun. I'd rather do 10 timing belts......

Just a few of the parts back from the machine shop and that big 18GXT-R. 100mm JE's, STi rods - resized with ARP-2000 bolts, Nitrided STi crank.... etc. There's a whole stack of other parts nearby. GD

it is relatively easy - just need to get the brakes loosened up. might be as easy as a short tow (preferably backwards & only a few feet - don't want to tear up tires) to break them free, or it may be more involved - as in jacking it up, pulling the wheels and getting in there to free up the pads/shoes manually. hope it goes easy for you.