I'm in the final stages of completing an h22a1 swap on my 94 prelude si. It had the f22b in it. So far everything has gone according to plan. The wiring harness plugged in perfect, the motor sits fine, but the one problem I did run into was that the exhaust manifold on the h22 didn't match up to the downpipe on the car. I'm ordering an aftermarket header with the downpipe in hope of correcting the problem. I knew that some f and h series parts were interchangable. It surprised me to see that almost everything was the same (bolt ons), except for the headers.