carb linkage modification / m-8 trans

The cable pushes in on acceleration, is out at idle. You just need to mount it so that at WOT the cable bottom out, at idle (fast-idle/choke off) it's all the way out. The specs for adjustment is to install with a "loose pin fit" in the clevis to carb/arm connection (the arm was on the shift linkage rod on six cylinders, not the carb), then extend the clevis two turns. You  an go as much as three turns longer to improve shifting a bit, but much more and you'll find it kicking down to 2nd gear when pulling hills and trying to maintain speed. I mean down-shifting much earlier than you'd like! The governor in the trans prevents down-shifts over a certain speed, but that's like 65 or so with everything set to stock specs.

One way to figure out arm length is to look at the stock location and measure from the pivot point out to the attaching point. An arm on the carb (or added arm) that same length should do the trick. Then it's just a matter of fabbing a mount for the cable.