i have looked thru my books and asked questions on other sites. it was not a standard option, but could have been installed by a dealer. i have a 1966 chevrolet dealer album (very cool reading) it only shows a powerglide, 3 speed stick or 3 speed with overdrive as options.
i would suggest using a powerglide with a larger stall. it will be easier on the drivetrain and will be very consistant. tom