Good question but the Mopar Stage VI heads were also screwed up in a similiar fashion with a short valve and not much room for the valve spring. My guess is that the Edelbrock engineer just wasn't thinking about a 2.00 inch spring height when he did the CAD drawing.

From what I've seen over the years the rocker shafts need to go down not up. When you are opening the valve farther then the midpoint is lower not higher. So the shaft needs to drop into the head in order to get the correct geometry. Lowering the shaft is much more difficult than raising the shaft which is why most people don't bother. The Victor heads do have large flat pads in the correct place so Jesel rocker arms should fit. I haven't put Jesels on a Victor yet so I don't have any pictures to share but maybe someone else does.