Probably the easiest thing to do to limit the vac using an after market 2 or 4 barrel carb would be to limit the travel of the old vac advance arm by drilling multiple holes along the arm and pinning. Some experimenting will be necessary to find just the right amount of travel without pinging. Ultimately you may have to completely disconnect the vac advance. The newer HEI set-ups you can buy the adjustable vac advance.
"Drugs are money, money is power, power is security." - Kent Heiner
Nedrow population 2212
Carbon footprint family of 2/11 tonnes of CO2/yr
| 
