car is a 69
Are the poly bushings thinner or thicker? Are your original bolts/washers in good shape?
I've never seen original bolts that were in good enough shape to reuse.
I used my original bolts and washers with urethane bushings and have had no problems whatsoever. Mine is a Southern car and they were in excellent shape. But--new bolts are not that expensive if you choose to go that route. Good luck.