I was useing the original factory hurst super comp Pat. pending I got with the transmission till I desided after 40 years of use it must just be worn out. bought a new supercomp They have improved it by adding positive (adjustible) stops this is worth it allone because the connections to the trans. no longer take the shock of a fast hard shift. I had to do some welding and grinding to repair those pieces recently, a real pain ,, just buy a new super comp, you may have to make some bushings to match your linkage rods (at the shifter) and shim or weld if the slots or studs have been damaged at the transmission make sure when the trans.is in neutral that you can slip the right size pin or drill bit through all the holes and locater in the shifter this puts the shifter where its suppose to be in neutral ajust with the threads on the rods or bend if nessesary also you will need to get the right thickness washers behind the cotterpins to take out the play
Happy Shifting! Bruce Johnson