[olddog]

Shorter push rods would solve the lifter adjustment, but I'm not sure the rocker would center over the valve stem correctly.

I am not certain that the locking adjusting nut would work well with the factory sled type rockers either. Wish I new for sure one way or the other.

Give a look at roller rockers. I think there are some inexpensive stamped steel designs that are not full rollers, all the way to high dollar stuff that an all out race engine doesn't need. You need the guide plate with rollers and they require hardened push rods. You may need different length push rods to get the roller centered on the valve stems. If your setup already has the guide plates, it's possible your already set. Rollers are a better design.