I was getting ready to put a 670 back together with a used P/C when a couple of other members led me to the 268 P/C conversion. It's the same 50mm bore, but my main reason for doing this is to get rid of the 670 boot and pulse line.
Purchased the Gilardoni P/C kit and intake block from Northwood, seems to be very good qualtity. Found an old 670 intake elbow with the support foot, and so far it's all looking good.
Pics - I use an old 630 cylinder as a pressure/vac test jig
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Dry fit of the carb, block, intake elbow, still need to change the carb top cover
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Piston/cyl
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Looking good........The Gillardoni is very good quality....and will run good....but to bad you couldn't have come up with a 268XP cyl as it makes power more like the 670. The first itteration of the 61/268XP in my sig started with the Gillardoni, ported and it was much stronger than the 61 but doesn't hold a candle to the XP P&C. If you are not into more power then you'll probably enjoy it.