big bolt pattern

with a taller stub you alter the roll centre of the car its like using longer balljoiints (ask a 57 chevy dude)
the effect on handling is much like lowering the car without lowering the car.
go too far though and the upper a arm bump stop doens't work anymore the upper A sits higher, and it would then, with wheels off the ground, allow too much suspenion droop... just don't do dukes of hazzard jumps... all will be ok.