I got an offer today on a B20 swap in my integra for $1500. It's a 4 door '90 RS. I was originally going to build a B18b or put a B18c into it. But I've been told that the bottom end is pretty torque worthy and that all I would REALLY have to do is build up the top end and I would be pretty straight. What are the specs on this motor?(US and JDM), is this a good idea?, and has anyone else done this swap?