I have a '91 GT with a little over 40k original miles. Other than a few bolt ons it's totally stock, and it's way overdue for some suspension work. I'm about to do shocks/struts and lowering springs, but I have no idea whether I should replace all of the bushings while I'm at it. I'd imagine it would be useful, but is it necessary? Also, if someone has an idea of how many billable shop hours replacing the bushings would take, it would be much appreciated. Thanks!