The last engine we were assembling with Dart Iron Eagle platinum 215 cc heads had a similiar problem. We had to use Crane off-set rocker arms and we cut the guide plates (compcams) and ground-fit then welded back up. We also offset milled the slots in the guide plates and used 3/8" push rods. The problem is the push-rod centerline and the casting are too tight. Without the offset rocker arms, just moving the push rod with adjustable guide plates puts the roller tip of the rocker arm off the center of the stem end of the valve. This problem only occurs with the intakes. Our exhausts were ok. Correcting the problem is a time consuming job, but once its done properly, you shouldn't have valve train issues.