So... this is my distributor and I can't figure out how to adjust the vacuum advance. I've tried the allen wrench approach, but maybe I just don't know the right size of wrench, either way nothing seems to work.... any thoughts anyone? I'm hoping someone here knows how to adjust this! Thanks!
http://www.msdignition.com/dist_15.htm

 

i would hope that thing is adjustable, my accel (which was cheaper than the msd) came with a proper size allen wrench. you might be limited to the bushing things and the springs with the msd. throw the lightest springs in there and see where your at, then maybe back of one set heavier or one/one with springs (yes you can mix and match)