Many thanks, quite right. yes they were similar... but thats it.
However, I did pick up a 400 motor with a good starter & pinion gear, & chain tensioner which seems to be all I need from that motor ATM.
Found the piston siezed in the original motor, but the piston cleaned up ok, and honed the bore and looks good.
Questions;
There's a partial gasket set available here, which is minus the clutch cover gasket.
Would the 82 XL500 clutch cover gasket fit?
Is there a complete gasket set available anywhere?
Thanks for your support, appreciate it, Neil