Will a 92-95 d15 vtec bolt right up into my 91 hatch, what trans would i use.
Its a std model so i would have to convert to mpfi, but what ecu's and harneses could i use?

 

ECU's depends on if you stay OBD0 or OBD1. Secondly you need to convert your harness that is currently in the car to MPFI, as you stated. Yes the motor will bolt in. You need to use a 88-91 D-series cable tranny. I would suspect that several sponsors have the conversion harness and VTEC sub-harness that you need.