Thanks for the reply Gents, no, its not that hard to start and it hasn't had a decompressor fitted.
The orange starter will be removed and replaced by a green or white one. Impulse starters are a PITA and almost impossible to find in good working order.
So my guess is somewhere along the way someone re-engined this later model corvette with a 64 model motor.
P.S. the powertorque Victa Rapier just needed a starter re rope and the Sanli needed a carby clean and a new spark pug boot.
All in all a good little bounty..
Cheers, Ted