[Secret Squirrel]

Sledge,

I have the Smeding 351W Extreme, with the same parts you listed. There is no vacuum advance on my MSD distributor, yours should be the same. Armond told me to set the timing to 18 at idle. I have mine set there and it works good. I recently changed my MSD 6A ignition box to the 6AL. I checked the timing after the swap and it was still set to 18 at idle (800 rpm).
I have a copy of the spec sheet for the 351W Extreme. If you want a copy let me know.

Call Ben Smeding, if you need any help or questions, he is very helpful.