i just done some research, and the black top ZC will fit into your 89 teg. it is an 88-89 integra ZC. the motor mounts are the same, but there are some wiring issues. the main changes that need to be performed are the vehicle speed sensor and the electrical load detector. google 89 integra ZC swap and check out some of the forums and threads that pull up. there surly will be something somewhere explaining about the wiring differences. i've heard about a manual, but i've not seen one yet, that u can get at an autozone that explains about different swaps in honda's and acura's. it explains what swaps can and cant be done, changes/mods that must be done, what hp/torque will be added, lost. and thats a good thing u are doing for your brother man, i'm sure he'll greatly appreciate it. oh, and check out alot of the forums on this site, there are some threads on ZC swaps, i've seen some of them, but i honestly can tell u where to look for them at, lol. good luck man