No one seems to have the kit to do yourself unless its a borg clock. 69 is a whole nother animal and plenty of options.
This was the same information I got corresponding with the guys out of Illinois. They'll do the conversion for $130.
1968 400 Coupe, verdoro green, black vinyl top 1968 400 Convertible, verdoro green, black top 1971 Trans Am, cameo white, auto 1970 Buick Skylark Custom Convertible 350-4(driver)