Tubular A Arm info needed (bagged 64)

[kpc01]

I'm working on a 64 C10 and have tubular a arms with mustang II ball joints. That setup has 5x4.75 rotors on it but I'm trying to switch over to bigger McGuaghys big brakes and spindles that are 6 lug. This bigger spindle raises my upper A arm 1/2-3/4 inch higher then the mustang II spindle. Also I'll have to ream out my lower ball joint mount and weld in a sleeve for a larger ball joint.

My upper A arm and lower are close to parallel but not quite. How big of a deal is this? Just want to make sure I can run the bigger stuff and not effect its ride or laying out or any other things I'm not thinking of. Any advice or personal experiences?