-Trans
Does not matter which one you use so long as it is cable. What will matter is the clutch you get. 90-91 and 92-93 have different tooth counts on the spline of the transmission. This means different clutches (friction disk)

-Axles
90-93 DA axles...depends on the year of the halfshaft you get really though.

-ECU
If you stay obd-0 you use obd-0 LS ecu...go obd-1 us obd-1 LS ecu.
OBD-0 = 90-92 Integra OBD-1 = 93-95(might be 96 don't remember) Integra