Not comet/mav related but could be! I experienced a stall and no start few days ago in truck after letting it idle for a few min. Truck has 429 with 750 carb. I know i,m expetiencing vapor lock because fuel line and filter is hot and dry. Fuel usually spill from line when i disconnect line to carb. When this happens line is dry. Trying to resolve this issue i replaced 750 demon carb with a holley 2300 and replaced pump. Truck ran great on home from work in near 80 degree temp. In yard i let idle and watched temp. Idled great at 190 for about 10 min. I went to rev motor and started sputter and died. No restart. Pulled line and dry again. My next plan is to reroute line and filter and wrap with something. I,m also researching electric pump. Any of you installed an electric fuel pump inline with your mechanical pump? Or should i be thinking abandoning mechanical for an electric? Would love to hear your solution.