67 twin turbo dart

So I am making some assumptions here but doesn’t that cable thread in to one of these?
B00FCD57-5A0F-4853-A922-6BAC26D22C22.jpeg And doesn’t your trans have one of these that accepts that piece?
B926538E-7C63-4706-AD47-C3DB8299383B.png
if so you can drill another hole in the bracket closer to the pivot and you’ll get more movement from the lever.

B1B2C381-78BF-4ECE-A040-C1E490A89364.jpeg
like this.