Well it APPEARS that the cover was put on not all the way tight, to accomodate the second row of screws. If you like the sound, then no, I would not change them for newer Gibson pups, but there are newer Gibson Pickups I generally prefer to T-Tops, but I am not you. But I would think the dirty fingers would be more of a bridge pup.
Here is a link to the current Dirty Fingers:
http://www.gibson.com/en-us/Division...rty%20Fingers/