I know some years of A bodies got a factory sway bar. If yours has the vertical end links that connect to welded tabs on the LCA's then that would further confirm that possibility as some aftermarket ones use their L tabs to bolt on the LCA. To ans your Q yes just toss it if desired. The possible slight increase in leaning when she makes a turn will not bother her near as much as the rattling. EDIT & with the bushings being that shot/worn out you probably ain't recieving much lean control anyway