I can't see how running the best quality commericially available fuel (ie 9 is a bad things. Should give you a better bang cleaner burner. etc, might also be able to run a touch more timing.
I echo woody's sentiments though. Spend the cash, and get them tuned up properly. Take them to a place with a dyno, and a couple old alfas hanging about (They have twin DCOE's as standard ) That should see it run a bit smooth, get better economy (if you're running too rich and fouling plugs atm) and hopefully get a few more neddies though.
You may want to look at other short term goals too, ie cam, electronic ignition and stuff. No point getting it tuned, only to change cam a month later, if you know what I mean?
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