76 duster. 416/727..3.55 rear. street car with a few passes yearly down the strip.

currently on original T-bars and leaves with air shocks to clear 275-60 15 rear tires.
car has always handled poorly,i installed new front rod ends/bushing/ball joint kit and magnumforce non adjustable upper arms. was told by shop that car must of been hit at some time(core support is wrinkled a bit) and couldnt get the extra caster thats suppose to be built into the magnum uppers.
So time to lose the "jacked up 70's" look, i want to go to maybe 17x7 front 17x8 or 9 rear wheel. first ? is which height leafs to get to clear 17", +1 or 2" over stock ? standard or heavy duty? i want to get this car handling decent.
second ? the shop said should be able to get more caster if i had adjustable uppers so recommendation on which brand of adjustable upper cntrl arms and torsion bar size?