I need help installing the rocker covers. Yes this job is easy but I don't know what happened. Pulled the engine from my hardtail frame. (Sent the frame out for new paint) I had one hell of a time getting the engine back in. I removed the rocker covers and the engine slid right in and bolted up fine. Now the rear rocker cover will not go back on, not enough clearance. What did I do? Any special tip? Yes, the rocker covers were on when I removed the motor. I didn't install the motor with the covers on because I didn't want to scratch the paint. The motor is a 73 Ironhead