it also looks like the lokar kit is being used.
in my opinion, those are junk. i have changed many of those setups over to the bouchillion kits, as well as changing to mechanical factory type linkage.
also, there are several throttle pressure levers used over the years and applications. this means you still have to figure out the correct leverage ratio.
you can also drill a different hole closer to the pivot point if necessary.
a couple of times i was able to get the lokar kits to "function", but it was still not right. that lasted until the cable stretched, or the brakets bent, then it was back to the beginning.
i heartily recommend changing that setup out to something else as mentioned above.