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What ignition are you running? Is it a multi spark or high energy ignition? Either stock late model Ford, MDS etc? If so your plugs will work better at .045-.050, enless you are running super high compression.
If you are running standard points .032-.035 is fine. You settings may differ in the idle circut running straight 91 octane or a mix of gasoline and xylene. You may want to get it running and turn the idle screws in until it starts to run rough, ease them back out until it smooths out. 3 1/2 seems like a lot, but with 25% alcohol it isn't surprizing.
Xylene is 114 octane, pump gas is 91 octane. 20% xylene will net you a 96 octane mixture. (2 gallons of xylene 8 gallons of gas). 30% will net you 98 octane. (3 gallons of xylene 7 gallons of gas) Do not exceed 30% xylene as it becomes corrosive to rubber parts over 30%.
Have fun,
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michael
A man that is young in years, may be old in hours, if he have lost no time. But that happeneth rarely. Generally, youth is like the first cogitations, not so wise as the second. For there is a youth in thoughts, as well as in ages... Sir Francis Bacon (1561-1626)
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