From what I see on Mancini Racing's site. The Max Wedge cables are 23.5" and race Hemi's are 25.5". Both with the double clevis ends. That may be what I need to use. I'll have to take some measurements.
That’s right, I bet the max wedge would work for you. I know they aren’t cheap though, you might be able to find an original slant six cable on here for a good price.
Edit: don’t listen to me, I’ve only owned one early a: 66 Dart slant six A/C car so it had a cable, but apparently pretty rare to find.