As I said on MSN chat, best with Pulsar and old worn Lucas etc dizzys generally is to forget static- set it to 30* full advance at 4000+ rpm (or wherever the advance ceases) using a timing light.
I do this by putting TDC and 30* marks on the crank pulley.
31mm measured around the 1098/1275 balancer is 30*.
30* total is pretty right for most A series. If yours needs a little more (like mine) or less for max performance that's fine, but ffs mark the pulley when you've got it right, then you can get it spot-on next time.
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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.
I think book says 5* for Lucas dizzy.