I ran the Crane on my stage 6 heads years ago without issues. As I recall there might of been an offset on either the intake or exhaust that was unique to the head. Otherwise shafts and hardware was the same. I had studs and billet hold downs. They had shims for side to side alignment that needed to be used when setting up. Sometimes push rod clearance may have to be made depending on lift and push rod size. I also recall some block clearances needing to be made on cylinders 1 and 8. That may vary from block to block. All part of the mock up procedures.