Timing for Pinasco 213cc + 60mm crank

Can someone help me with this engine:

Pinasco 213cc
Mazzuchelli 60mm crank with 1.5mm base plate
Dell`orto PHBH 30 carb
rotary intake (Malossi manifold)

What should the timing be? 24 or 20 degrees BTDC? I`ve seen different info on the net.

Any suggestions for the main jet and needle size for the carb?