geterdun
+1y
Check the compression. Do you have all the vacuum ports (a biggy would be the brake booster) connected/capped on the intake and carb?
Is the intake seated against the head?
Should be 17-20 inches of vacuum, running, at idle.
When cranking the engine, throttle open, coil lead to distributor unplugged, vacuum gage should have reading of 3 inches or better steady; weak cylinder or open valve (or head gasket leak) will fluctuate.