MSD Digital 6A and HEI

[61ragtop]

Yes I too noticed that last bit about the "dither".

My vac at idle is a solid 17'' Hg with the extra timing from the vac adv on manifold and was only 10-12''HG on the ported vac. When I get the top end put back together and she is running I will re check it.

I will also use a long hose and check the vac readings while I drive. What driving situations should I be ovserving the vac readings and Should I do this on both vac ports? I will also map out my curve too. All I know is i have 35* all in by 3100. I will map it as you described and see what I have though.

Re ignition box, I am guessing the Digital 6A will suit my needs just fine? With the auto trans I shouldn't need a rev limiter that the 6AL has? I do plan to go to fuel injection in the future, will the 6A be fine with that too?

What is a good way/sign to find out what the engine likes as the initial timing?

Here is where I am at now......

16 inital no vac adv hooked up
35 total no vac adv
27 initial with vac adv hooked to manifold vac at idle
44 total with vac adv all in by 3000rpm in neutral no load

The 35* total was set by my engine shop that dynod the engine but not in the car.