ac from the 91 is not compatible as neither are the lines. would have to change intake,injectors,dizzy use and extend your harness in a cpl places and i cant remember if alternator plugs are diffrent.also get 94 up tegra mounts and a hydro to cable conversion, the 91 shift linkage worked on mine. also i dont know how new this is to some but a civic ac compressor will fit but you have to use a crv bracket and modify you ac lines CAREFULLY...may have to change crank pully to 94 up and power stirring line to rack too as civic is too short! OR JUST GET OBD1 LS 94-95 OR UP! ITS SOOOO MUCH EASIER, MORE LIKE PLUG N PLAY...