I had the same problem with my distributer, being locked out. After running, I would stop for gas and it would start slowly or, not at all. Try a timing retard from Summit/Jegs ect. It reduces the timing on start up. It works great on mine. I have a MSD 6-AL so, I bought this one.
http://store.summitracing.com/partde...5&autoview=sku
Kevin