Vespa T5 polini 152cc head spec.

Hi All , I have a polini fitted to my T5 its just about run in. I want to get the head machined asap.  I have a 900 mile tour to do next week but have lost the spec sheet that came with the kit . I`m going to use my local engineering shop. Can anyone tell me the specifications to pass on to the engineer or can i download it from somewhere. Also i need help with the jetting its running on  standed carb  with a 6.5 hole in the heart, SIP fast flow tap, cosa clutch. Currently it has a sito  but it will have a left hand JL exhaust (BSAU 193 1990 T2                 Thanks[:D]