transaxle camber with weld?

[ALF750]

Hi, I read somewhere you can get some camber in the rear of a transaxle car by running a bead of weld along the top, then it shrinks back to give the neg. camber.   Is there any rule of thumb for inches of weld per degree of camber??   My 75 must have been dropped on its head sometime, as it has 1.25 deg toe in on left and -0.55 deg neg camber on the right, so wondering if I could correct this so both sides the same?  TIA