Personally, I wouldn't get hung up on the Starmaker, though the gearbox is all needle-roller, a distinct advantage compared to a stock villiers box, although maybe less so today when the strip/rebuild routine is likely to be more frequent than for the average clubman in the 60s. Don't forget the early bikes also used the alpha bottom end with Greeves alloy barrel on top - this is an alternative pre-65 setup; finding a Marcelle or Parkinson barrel would bling up this setup. Or go with a Greeves challenger 250 engine and albion box, far easier to find than a good starmaker. Or alternatively, and finally, if you are looking for pre-70, why not go with the VERY easy to find Greeves Griffon motor and the unburstable Greeves box that went with it....Having said all of that, I might be tempted by a squarie Maico...