I'll try the heaviest springs and lightest weights I have. I can always lighten the weights if I need to. How many total degrees should I be getting from mechanical advance? How does this affect performance/engine life etc.
68 GMC short bed (4100 lbs with driver)
The distributor is a HEI-Accell (have tried 3 different sets of springs & weights)
Heads Dart Iron Eagles - bowls blended/ports reworked
Forged pistons 10.7:1 actually CC'd at 10.25:1
TH-400 with transgo kit
410 posi rear