Ok, so I've finally thought things through reasonably, And I've decided not to go with the k20 in my civic, instead I'm going with a B20 with a B18 head, though I'm still a bit confused with the transmission issue, as well as the wiring harness. Should I be looking for a transmission for a B20 as well? And as for the harness, if I plan on going Hondata in at about the same time (gonna get everything done at one, save a fortune on labour costs) does it really matter? Any other pieces of advice greatly appreciated. Thank Guys.