Thanks Banjo, great advice, really appreciate it.
The engine has been running after the previous owner rebuilt / modified it etc (many unknowns)
When i first got it the starter motor was cooked, so i have replaced that with new. Next i went through fuel lines and discovered the fuel pump was also shot. using advice on the rollaclub threads i also located a fuel blockage inside the tank oultet. Fuel pump replaced with new and lines now clear with good fuel pressure to the carby.
even with the timing not right and carby not tuned, i can start it and keep it running ok but will not idle yet.
So i feel i have spark/air and fuel, although not tuned or timed correctly it runs.
Focusing on the manifolds to eliminate potential issues there and next will be to get an exhaust fitted.
I think without an exhaust fitted, tuning and timing will not be 100% anyway. so its step by step at this stage
thanks again, regards Gav