Assuming you got an obd1 COMPLETE motor swap, its cake. complete meaning the tegs mounts, axles, tranny, shiftlinkage, ecu, etc... (94-95 LS)
if your hatch is a CX or VX, you need to convert to a 4 wire O2 sensor.
use a 94 LS upper radiator hose
use a 94 del sol vtec lower radiator hose
use a 94 LS throttle cable
if you want A/C, you need a 94-95 del sol vtec a/c bracket
and thats about it. everything else should plug right in.