318 stalls in Drive

Excellent point. Somewhere I have a chart that shows the advance curve for that distributor. Somewhere. I wonder if I could just tie the flyweights down so they don't move and check the timing? Or just have someone put the truck in Drive while watching a timing light?
Yes...either will give you some info. I would try the latter first. I still think your convertor is way tight for that cam, and the BBD is not suited for both of those without some modifications.