distributor springs

The timing light is your friend if you have a particular curve in mind but like the guy's said, performance tells the true story. Try the factory light spring only and if it screams and doesn't ping, that's what you need. If you get a little ping, add the Mr Gasket spring and see if the ping goes away but the performance is still good. If you don't have a light you won't be able to check total with the vacuum advance plugged but if it doesn't ping it's probably ok. Timing can be a tricky combination but it can make a big difference if you find the correct mixture. tmm