Update:
So I tried the starter fluid; no change. Pulled the plug and had the better half crank it over for me; couldn't see a spark. So I hooked up the battery charger and set it on booster, and it fired right up! Why in the world would it start with the booster, but not without? I've got the battery charging now (it too is new).
Probably time for a little more history. I hate writing dissertations, especially if it's irrelevant; but in this case it probably isn't... When I got my blazer back from the bodyman, it would only seem to run for about 15 miles or so, and then start cutting out. The radio was barely working too. I had the alternator swapped out thinking it wasn't charging, and then had the distributor/coil replaced with the smaller style (I hated that the old distributor was so close to the fire wall, actually touching). Nothing seemed to fix it. Then my mechanic checked the voltage coming out of the fuse box (at least I assume that was where he checked it) and it was around 11 volts.
So my bodyman took it back and (again I assume) fixed the wiring (and a couple of other minor things). I've probably got 500-600 miles on it since then without issue, until now.
Any thoughts/suggestions on what to look at for a long-term fix? I'm thinking I might put a new wiring harness in this winter; maybe that'll take care of it?
Since I know that we all like pictures
I thought I'd share one from our trip into the mountains last Sunday with the family to pick huckleberries...thanks everyone for your help!