the type r swap is very possible.
these r the only issues you would have to worry about.

· Wiring Harness-You will need to use your existing B18A1 gray plug wiring harness. It will plug into everything on the motor except for the distributor and injectors. And just like the B17A1 engine, you’ll have to add the 3 wires for VTEC and 1 wire for the knock sensor. The black plug harness that comes with the OBD-2 B18C-R cannot be used, but can be sold for $100-$125.
· Motor Mounts-Use your existing B18A1 mounts. They are slightly different than the B18C-R mounts.
· Distributor-You can use your B18A1 distributor but the leg towards the front of the car has to be cut off to allow clearance for the VTEC purge assembly. You will only have two bolts holding your distributor, but that is adequate. . You can do this or your other choice is to buy an OBD-1 VTEC distributor (92-95 B17A, Del Sol B16A, B18C1). You can find them on the net for as little as $100, but most are priced at about $150. The OBD-2 Distributor that came with the motor cannot be used but can be sold for $150-$200.
· Injectors-You will need to use your existing non-OBD B18A1 injectors. The OBD-2 injectors have a different plug on them made for the b1ack OBD-2 harness. Other than that, the injectors are identical.
· ECU-This motor will come with an OBD-2 VTEC ECU (P73). You cannot use this ECU with your harness that is inside your vehicle (OBD-1). You have two options. You can sell the ITR ECU and buy an OBD-1 VTEC ECU (P28, P30, P61, P72), but you may want to consider getting an after market chip to up the VTEC x-over and redline to Integra Type R Specs. Or you can buy an OBD-1 to OBD-2 ECU “converter” from many import shops. This will allow you to use the OBD-2 P73 ECU with your OBD-1 car.
· Transmission- This engine also comes equipped with a hydraulic transmission with LSD and shorter final drive than the US spec ITR transmission. This transmission either needs to be swapped out for a short geared cable transmission (JDM YS1, G2 GSR YS1) or I believe Place Racing makes a hydraulic to cable converter that you can use. But then you are talking about more money (but it may be worth it to have the LSD and the shorter final drive). Again you can buy an S1 short geared transmission, but you will need a clutch assembly from a 90-91Integra. If you get the B18C-R flywheel with the engine, use that with the JDM YS1 or G2 GSR YS1 since it is 14lbs instead of 18lbs like the rest of the B-series flywheels. Lighter equals faster revving!!!
· Clutch-Depending on what transmission you go with (90-91 or 92-up cable transmissions) will determine what clutch you should get. If you get a 91 or older cable transmission you will need a 90-91 Integra clutch assembly. If you go with the 92 up YS1 Cable transmission, you will need a 92 up Integra clutch assembly. Use the matching flywheel with the same clutch. If the B18C-R motor came with the flywheel and clutch, use those with either the hydraulic transmission with place racing converter or buy a YS1 short geared cable transmission.