That covers gaskets, seals, cam chain, idler and tensioner shaft rubber blocks, guide rollers etc. The only slight problem is that the cam chain tensioner roller is no longer available

Just out of interest the gearbox output shaft is also no longer available - but even if it was still available, I suspect the price would be astronomic

The price above obviously does not include any machining / welding etc to put right damage to castings or any other repairs / replacements that would be prudent on a motor of this age.