29 Super Six compressions

My 29 is finally running. Working on Making it run better. My compressions are 60-62 on 4 cylinders and 45 on the other two. Doesn't really smoke, but hard to start. Is this more likely a carb issue? Timing/ignition? Or low compressions? And can I expect the compressions to improve a little with more run time after its 30 year slumber?



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