All good tips, thanks Tuckerbag. Thanks mate.
I just pulled the pipes off and looked in the exhaust ports and everything looks great! the bores still have a nice cross-hatch on them too. This is incredibly relieving as this bike was a bit of a gamble.
The carbys will be coming off, and I have another set i got with the bike which I suspect are Mk 2 mc18, so I will do some reading there and see which would be best to rebuild.
Thanks again mate.