we just finished swapping an obd 2 into an obd1, and let me tell you, it was NOT as easy as everyone said it would be. going into an obd0, i think i'd cry.
other than changing my mind and getting an obd0 motor, here's what i would do-
first things first, is i would get an obd1-0 conversion harness. convert the car to obd1 as best you can. run an obd1 ecu (chipped p28 would work good)
now that we want obd1 electronics, we need to do some cutting.
you need to cut/splice the injectors onto your teg's harness. I'm not sure if you need a resistor box or not, as you are going to be converting to mpfi (or are the tegs already mpfi?? im not sure on this)
you will have to cut/splice the distributor plugs to use the itr plug on the RS harness.
you will need to swap altenators faces. perhaps the RS teg alternator will work- im not sure. but for our d-series, the mounting points were different, so we had to swap faces to get the plug.
vtec- you need to run wires for vtec solnoid. depending on if your itr uses the vtec pressure switch or not, you will have to run that wire as wel. If you are using an ECU that looks for the pressure switch, all you need to do is join the VTEC pressure switch wire with the VTEC soleniod wire. If im not mistaken, the JDM itr has the pressure switch tapped off, so you can do the above.
you will have to lengthen your o2 sensor wires probably as well.
evap/purge control- the p28 looks for it, and will throw a code if its not wired up. if im not mistaken, the jdm itr doesn't come with one (as its US emissions shit) and im not so sure that obd0 motors had them either. if thats the case, i can't help you there. if your motor does have one, you will have to jerry rig that one to plug into the p28 and the vacuum of the itr motor.
The tranny from the ITR is hydro. your car is set up for cable. you need to run a master cly. and all the lines for the hydro fluid into the slave cyl. I think there are kits out for this- but it mioght be the other way around (cable tranny onto hydro car)
I'm sure im missing a shit load of info. as you can tell, its not easy. If you have never done a swap before, i highly suggest you either re-think your plan to go with the itr motor, pay a shop who has done it BEFORE (trust me- lots of 'expereinced shops' probably haven't), or C- deal with the fact that it may take you 6 months to get your car running again. And no, I'm not exaderating. it may take a week or 2, it may take 6 months. Just be aware of the complexity of the swap you are doing.