Another odd thing I noticed was that I couldn't bolt up the dimmer switch or the parking brake cable cover. It was almost as if the cable was 4 inches too short. I tried loosening up the adjustment, but the casing was just not long enough. I broke out the FSM and checked the fitment. The picture clearly shows I had it in the correct position, the rear-most frame cross member flange.
Brainstorm time, I decided to move it to the front-most cross member flange, but the hole was too big. It was clearly meant to pass through the large hole and attach to the rear. I remembered a discussion that Fury cables were a few inches shorter. Did I have the wrong parking brake cable? Under the car I go to remove the cable (did I mention how I hate doing things twice?). I measured the three I have, two from 1970 and one from 1973, and all were the same length. I decided to go with a quick fix and use a hose clip to hold it into place on the front cross member.
Everything fits correctly now:
I still needed to figure out what the problem was. The parts car with the torsion-quiet stub frame was no help, there is only one cross member flange. Then I remembered that the stub in my 'vert is from a 1969 Monaco! When I first got it I had measured and compared everything between the original and the '69, it was a perfect match. However, I did not check this small detail, and I had long sold the old stub so couldn't go back and check again (yet another example of how hoarding is good, and getting rid of stuff is bad).
I needed original examples to compare, what better place to do that then Carlisle.
First up is
@71Polara383 's Servprolara. The stub is exactly what I have under my car, and the cable is where it should be:
Of course, I had to compare a 1970 'vert, so I took a look at
@ayilar 's Polara convertible:
Ah ha! The correct cable fit for 1970!
I also measured the distance between the front cross member flange and the front of the stub and both were 16 inches, so the frame dimensions are identical.
This proved my theory, that there was a change in the length of the casing and attachment position of the parking brake cable from 1969 to 1970. The FSM was written early on in '69 which explains the discrepancy. Third times a charm and I will be breaking out the welder to tack a washer in place of the hose clip. Thank you gentlemen for the use of these visual comparisons!