Vacuum advance issues

[mud.man.rj]

You are right about that, all I know is what I have done working in the shop for 20 years on other peoples hotrods, what works works time after time, a lot of people know what they heard or read, but real world makes a diff. All you can do is try, make sure your vac adv hose is off and plugged when setting the initial mech advance with the stock springs, just remember to consider anything else in total truck that may influence a load or pinging situation when driving like brake drag low tires, engine heat zone like at operating temp not above, anything else definetily helps, even quality of fuel. You will get it, just takes time and figuring it out.