That head with the rocker shaft is not one with a canted valve configuration, your first head is a canted valve style seen by how the spring pockets are offset from each other instead of being inline like the second head. So the second head will make rocker selection much easier to sort out. The very first generation Duggan heads were canted valve, so this dates the heads you have as the second one being a little farther up the evolutionary ladder in terms of development than the first one. Duggan also purposely made the valve spacing unsymmetrical from cylinder to cylinder on the canted valve heads to get the ports straighter, so you may find it annoying to see their isn't even symmetry in the machining process he did.
