misfire

[levi15]

Hello been searching a while for the problem of my 86 chevy c10 with a 1990 350 converted to carb..did not personally do the conversion but problem i having is the misfire....so things i have changed are manifold distributor new plug wires and coil...ok so i did a leak down test because i had noticed there was some blow by out of the valve cover breather , so the results are cylinder 2 was the lowest at about 22% leak and the rest were at 15 to 10% and spark plugs seem to be wet with oil could this be bad rings cause of the misfire?