Disaster Strikes U.S. Army 1952 Dodge 3/4 T 4x4 M37

We have installed 3 different rebuilt carburetors it still sounds like a hit and miss engine. Checked with a vacuum Gauge no leaks. running clean gas not using the original tank. Checked spark it at first puts out a hot blue spark but at each revolution it gets weaker. Last idea and hope is the original coil has gone bad I do have a new replacement. Maybe it could be the condenser has gone bad or the points slipped. Anyway if that doesn't work its heading for the scrap yard.