Fresh 340 rebuild issue

Broke in the cam without any issues, only have a few hours on the motor. Now when I fire it up, there is smoke coming out of the drivers side exhaust once it warms up. Could I have possibly installed one of the rings upside down? I know the rings are not broken in yet but hate to destroy the motor. The right side is clear all the time. Any suggestions would be helpful, I hate to pull it and remove the pistons if I don't have to.