I do have it at the back of my mind to replace the timing gear and cam in due course. The cam will almost certainly be shagged, but it makes very good power when it makes any at all. In line with my "upgrade as you replace" policy a Piper cam and better timing gear will be on the list.
Dizzie drive gear was, indeed, very fecked.
Tim Hobbs
'58 Series 2 '77 101FC Ambulance '95 Discovery V8i