dead cylinders

[66CHEV]

250 6 cyl. starts fine but dead on cylinders 1, 3, and 6. I have good fire at the plugs, compression on all 6 cylinders is around 145 psi with less than 5 psi difference between all 6. i have taken the exhaust loose verifying there is no restrictions there, plugs on the dead cylinders are not wet when you take them out, which lead me to believe it is not getting fuel to those cylinders?? any thoughts. i was chasing this same demon about a year ago, when an icy bridge put the truck on the sideline for a while. i now have most of my body work fixed and am back to chasing the engine troubles again. any ideas would be appreciated. thanks