I own a 1980 CB 750F. The original engine is in my basement with about 21k on it (previous owner decided to paint it black, ugly flaky mess). my currently running in bike block came from Cali and has the typical minor compression drop in the center two cyls due to lack of water cooling. these engines will swap out in your bike as well. I would be willing to trade for a rebuildable front end or straight frame, or some other arrangement.