Vespa VL3C

Found a Vespa VNC 150 for sale. Its placed a long way from where I live so I dont get to se it.

Is this piston ported?

How many studs to fasten the barrel to the cranc casing. Kan a barrel from GS 150 / SS 180 be fitted?

If the cylinder is on its 3rd oversize. What opsions do I have next?