Sway bar recommendations 74 Swinger

Hey guys,
Looking for sway bar recommendations. My suspension set up : stock shocks, all rubber bushings in a all pretty much stock suspension except for the pst 1.03 torsion bars. eventualy a 360 will be added. I would like a nice medium as I am not really track racing or doing extreme cornering. Just looking for something to help the rest of the suspension out for better handling cornering on a street car. ALSO, I have seen some of the kits are these direct bolt ons? or is there some drilling modifications that need to be done to install them?