[Tony]

The Easiest...do some searching, there are plenty of how-tos and walk throughs on doing the MPFI swap and a Z6 swap. The easiest would be do the MPFI swap, use a D16A6 computer(88-91 Si), along with a D16A6 distributor. Swap out motors and do any necessary wire changes and add the VTEC. The Z6 came in the 92-95 Civic and Del Sols. Im unsure on exact models.

Trust me, you don't want to swap out entire harnesses, its a lot more work than you really want.