BDR Twin Dellorto DHLA 45C Main Jet 180 Air correction 150, 38mm choke,  looks to me (much googling and looking at examples) like this is intended for high airflow and fuel delivery at higher engine speeds.

However, having zero experience I need the voice(s) of experience please?

All the examples I see are smaller, but intended to allow round town and general road use. 

and "yes" this is what my car is jetted with.

ok, so it seems to me this is jetted for WOT use at the expense of round town and m.p.g.

Suits me for what you might call Alpine hill climbing for hours on end.

Anthony

edit: ok no surprises no responses; it's now very old tech. I'll demote this "conversation with myself" to a blog entry - which will have chatter about a selection of jet alternatives I have ordered.