The Corvette DBW pedal mount I got for my 72 from Hart_rod here on the board seems like it will work well.
https://67-72chevytrucks.com/vboard/...d.php?t=631165 Remember seeing something that bracket will fit early and late model 67-72 later in the thread. The Corvette DBW pedal is identical to the trucks. The Cheyenne super chrome trim even fits on it, factory or reproduction. He also has one for the truck pedals. Listed in the same forum.