I looked for a shifter from Hurst and Mr. Gasket but couldn't find one that would work with a truck 4 speed. Maybe the universal 3 speed truck shifter could be modified to work with a 4 speed? Now I'm curious what shifter you found?
The shifter in the original configuration mounts about 1/2" left of the tail-housing. Seems to allow room for the linkage. Even the shifter from the dodge truck sat left of the tail-housing, though not as far offset. I recall seeing a mounting plate that was bent over the top of the tail housing before, but don't know how it compares to what I've got.