It kind of depends on the intake manifold. The M1 4500 intake is a lot lower than something like an Indy 440-3X. I have throttle bracket and throttle return kits that will fit any intake that I'm aware of but there isn't a universal kit that fits every single intake.

The slant six cable is the one to buy. If you can't find that one then the one from a pickup truck will usually work but it is about an inch shorter. I published all the cable part numbers years ago.