G-strand mod... altercations???

[BuddyP]

Car: 1968 Camaro....

Was going to do the mod this past weekend but started doing some thinking (and yes, that's scary!). Anyway, the way I understand it, the Guldstrand mod is basically just relocating the UCA mount holes 3/4" lower than stock (then grinding the to of the UCA mount accordingly for clearance.). Should I consider relocating the holes not only 3/4" lower but also a set distance toward the rear to give more positive caster? If yes, then how far should that be for average usage (mostly street driven)? Or would that give too much positive caster?

Thanks!
Buddy P