Carb syncronizing

[oldyeler]

I am just now getting to my carb tuning and there must be something very wrong I pulled the engine last month to fix three engine leaks after the cam break in run
I went a head and used the time to try some different mufflers and finally built one.
I've checked the wires plugs and the intakes for leaks with ether .1&2 will not register on the syncronizerbut the engine will smooth out at partial throttle .I even shot a little ether into the 1&2 carb with no change at idle its almost like I have low compression only on 1&2.
What should I check now, is it possable that John Connelly sent a mismatched pair of carbs or that I may have 2 cylinders with low compression on a new build? or could the cam be wiping out 3&4 seem to be hitting good and they do show up on the syncronizer.