ahhhh christ! search dude, its been discussed ALOT. I put a 97 into my 90, switch manifolds, distributors, MAF's, add the s13 dohc coil, get a dohc guage cluster, engine harness(for the dash plug swap out the plugs, put the sohc plug on the end of the dohc harness, match color to color the rest of the wires are extra)....Just PM me if you have any more questions.