In an earlier post I described a problem with the vaccum advance on my 351W. Thinking I may have a vac leak somewhere, I did everything to find one - none found. It pulls a strong, steady 16+ with not even a wiggle on the gauge. But the second I hook the distributor vacuum advance to the carb (Edelbrock 1406) - it INSTANTLY dies and will not restart with the vacuum in place. It pops, spits and backfires, but will not run. I recently installed and ran-in the new cam and lifters (Comp Cams XE 256), and I'm certain all marks and pointers were properly aligned when reassembled. PCV and PB booster lines are secure. I'm about to just disable the vacuum advance and go strictly mechanical advance. BTW, the distributor is a Duraspark run through a MSD Blaster box. Any other suggestions since it appears I have ruled out the vacuum leak.