It's been five years since I restored my 360, but you shouldn't have any problem getting routine parts. Bearings, gaskets, seals, points, carb. kits, etc. are all readily available from Honda and/or aftermarket dealers. Fork seals and pistons aren't a problem, but I'm not sure about springs. Mine were within spec. One suggestion: go with Honda gaskets where possible. You have to buy them individually and they're expensive, but most of the aftermarket sets are leakers.
I'll have to check my files, but by '76, I believe most of the bugs were worked out of the 360 engine. The rocker arm issue was definitely corrected and the updated parts for the cam chain tensioner may have been factory-installed by then.