I am running a Lokar shifter. It is a floor mount. It required lots of custom fabrication. I mounted it next to the seat, which works out real nice. The transmission is a 4R70W. To get it to work I didn’t use the supplied rod, but adopted a cable. The shifter I got was for a C4, since I changed so much (including the transmission) I had to rework the shift gates.
If I were to do it again, I would still use a Lokar, but would probably do a Nostalgia shifter that bolted to the tranny instead of all the custom work I put into mine.