MSD distributor tuning

TT5.9mag said
You need the blue bushing for 21 degrees. With 15 initial, plus 21 that puts you at 36 all in. Then tailor the curve with springs to your combo. Big tires, heavy truck, small engine, means a long slow curve probably not all in till 4000. Probably one heavy and one medium spring. Then bring vacuum advance in for cruise.

I was thinking this with the springs. I tried this before with the edelbrock and the valves pinged badly and I put the heavily spring back in. With the new Holley, I think I will be able to get away with it. Actually, it would ping at 10* when I ran the edelbrock carb. One of the many reasons why I switched it out.