Push-Button Transmission Wanted

Sure there were. Early slant 6 trucks had them for one. So did the early B-body slant 6 taxis. Even the A100's had them although they used the lever shifter instead of a push button.
The early 727's behind the slant six were a V-8 transmission with a factory adapter plate. I don't remember for sure, but I think 1968 was the first year for a slant six case 727.
https://www.forabodiesonly.com/mopa...mate-a-slant-six-to-a-smallbock-trans.412996/