It's not fair to lump this in with setbacks, but it's just one more thing that got tacked on to a build that creeped. The V8 obviously speaks "roar" and the inline 6 does not. The rear end needed to be replaced, so I used the rear end out of the donor car -- a 1994 Mustang GT. In 1994, the differential was four linked. There's not enough money in the budget to make it that way in the '67 Mustang, so I cut all the brackets off it and smoothed it out for leaf spring mount plates.