I used the Mopar 452 heads (straight plug version of the Edelbrocks). There is a lot more clearance with the straight plug heads. Previously I had run the angle plug heads and had problems burning up one or two of the spark plug leads so I switched heads.

What you really want from a clearance standpoint is an angle plug head on the driver side and a straight plug head on the pass side. That would work the best for the spark plug wires.