O.K., a couple of ideas.They may not be the ultimate answer, but they're free/cheap.First: Run the coldest heat range plugs that don't foul.You can change them in only one cylinder at a time to save $$$ on plugs while determining which is the coldest it will tolerate without fouling. Second:Go to the aquarium supply section of your favorite retail outlet,and get one of those air distribution/gang valves for a fish tank air pump.{$3-$4}. "T" into your vacuum advance line going to the distributor and run the line inside the car to your remotely mounted valve. Bleed off enough vacuum from the advance to prevent detonation on cheap gas. Remember,you're not a"cheap a$$",you're innovative.