Pistol-Grip boot in an A-Body.

My hurst shifter from a truck has the pins. Would not be that hard to drill them out. Hole spacing is 7/8" on mine, bolt on type are 1" (I think) so that would make it a little harder but "doable". I would make a template with 1" spacing, drill one hole to size and bolt in on, drill the other...

I believe you will find the pins are in the correct location for the bolts, either knock or drill out the pins and put in some bolts, you should be good to go -