I did what you are suggesting, cut off the mount, trimmed the bottom and welded it back on but to the rear. I only moved it 1/2" because I figured I would add tubular upper A arms.
I haven't run the tall balljoint version against the G mod, but a taller balljoint is only 1/2" longer, at least that's what my early Howe uppers are. The G mod lowers by a bit more than that, so I'd expect the G mod to be about as good or slightly better than 1/2" taller upper balljoints. The tall uppers could even be added to a car with G mod, or the G mod could be increased a bit lowering the upper mount even more.
Mark has some taller lower balljoints and for cars that are lowered a lot that would help bring the LBJ back more to level and increase neg camber gain even more.
There is a limit to all this neg camber gain increase stuff. The static roll center rises and increases jacking effects along with increased roll stiffness.
Excessive neg camber gain will hurt braking.
My car will have a G mod that is a bit lower position than usual, I will use stock upper balljoints, then swap in the 1/2" taller versions to compare.
David
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