The bouchilon cable looks to be a copy of the factory truck and b van cable. You can pull just about everything you need for a cable setup from a late model truck or van.
That is some funky throttle bracket that you have on your intake..... no adjustment! Makes one wonder if you are even achieving wide open throttle.
If you want or need to drive the car in the meantime you can tie the lever on the trans 3/4 or more of the way back. This will raise your shift points and line pressure although you may find the shift points are now too high.