Yes, I have a 72 Nova SB and the jegs 3" system.
It fit good, Had to trim 1 head pipe, AND 1 TAIL PIPE, some clearencing dinging for the left rear tire. but kit went in well. there are no instructions with the kit.
must use their (jegs) recomended muffler size. take the kit to a good muffler shop for install. (wish I would have)