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On my 79 300 (last year of the B body) I got a polyurethane bushing kit from Summit Racing.
Not sure on a 73 but on my 79 they had rubber bushings on the torsion bar cross member mount also.
Those too are available in polyurethane. Man what a difference in handling .
Prothane, Energy Suspension, Firm Feel or if you want to stay original there are rubber ones. They are expensive, but also include the crossmember mounts. http://www.amsnos.com/shop/item.aspx?itemid=54
There may be other sources for these.