904 transmission issues

Are there any sharp bends? like 180 degree type. Some shifter cables will bind when they have those tight radius bends.
I am using a SCS Cheetah by Turbo Action on my 904 reverse valve body, for some reason their cable is able to handle tight bends.
Another option is precision shifters, PPP shifters they are available from https://www.coperacingtrans.com/

Good luck with your project