I recently purchased a 1990 Civic HB, (ed6, standard model?). It has the stock d16a6 with five speed manual transmission. After some research, I think according to my budget and what I want from the car, the dohc zc 130hp seems perfect. What confuses me however is that everytime I think I come across a solid "how to" help guide, there are so many variances. The engine will bolt right on, yes. I already have the dohc zc ecu and transmission, (another reason I chose the zc. I already have a good start!), but that is where there seems to be alot of different opinions. What changes need to be made to the stock car for the transmission and ecu to work? I can't find a clear answer on this. Thanks for any and all help!