I believe it to be a 1975 F0. I think mostly stock including exhaust.Still learning. Have a really bad fuel tank that I patched up just to see if it was road worthy.Have another tank being shipped from Edmonton Aberta thanks to my son, Jeremy and Killer Canary, who sold me the tank. This cb750 was found in a garage formaly owned by an extreme hoarder and has been sitting for something more than 17 years with dryed up fuel in it. Set points, adjusted valves, changed oil, fixed wiring going to one coil, replaced kill/starter switch, melted fuse panel and battery. Carbs were a disaster so cleaned them the best i could to see if it would run. It started right up. Comp. good at 160, 160, 150, 160. Short road test to check clutch and trans. operation and seems ok. Idle circuit not working right , won't idle under 1400 rpm. Now i can order some carb parts to do carbs properly. ie needle and seats etc. Any recommendations would be gratefully accepted. Thank you.