If 4" between holes isn't possible a good machine shop can make a plug for the original hole, press it in, and weld it in place. Once they do that it's like the original hole never existed. Then you can have a new hole drilled where ever you'de like it.
A good machinist should be able to make the plug, weld it in grind it off, and drill a new hole in about an hour
2013 Adventurer 32H