you cant use your d1.5 timming belt you have to use the timing belt from the car you got the head off of! i had the same prob. and all you need for the swap is vtec head, Si wiring harness, d1.6 si ecu, and have somone wire your car for vtec! you could also hook it up to your tech light that so when your light comes on your vtec will kick in! (if you do this i would take the light out of the tech because you dont want the comming on at 3000rpm's all the time! any more questions just pm me and i'll try to answer them best i can!