No need to be excused. Everyone is ignorant to some degree.
The magnum heads present the same challenges as a Chevy or Ford head with studs. You can adjust geometry with pushrod length, but finding a rocker the correct length for your combination can be difficult. Just centering the pattern ain't gonna cut it. Relocating the studs in the heads to account for the length of the rocker is even more of a hassle. In short, to do it right, they can be easy or hard. Usually hard.
