The common parts list covers your variant anyway; this is the one you want:
http://bsintek.basco.com/MDEXResultsPages/PDFDisplayPage.aspx?fileName=Z6jmyBVJ1DajIAs to the carby, yours doesn't look butchered, so why would you need the complete assembly?
These Pulsa-Jets are a very simple carby. Unless there is excessive slop between the throttle butterfly shaft and the body, it will be easily repairable. Most of them only need a pump diaphragm and a new carby to tank gasket, along with cleaning out the tank and checking the pickup tube screen.
If the compression is OK, there's no real need to open up the crankcase. Cylinder head off to clean off deposits, and check/adjust valve tappet clearances at the same time, should be all that's needed there.
It's true that they don't take kindly to being run with low oil, but as it hasn't 'thrown a leg out of bed', so to speak, its most probably OK for further use.