Old school...back in the day cars had a choke stat,that was heated by the exhuast.When cold it would close the choke and as the exhuast got hot it opened it.The old chryslers were totally mechanical and the ford and chevy had elec assist.If it were me I think Id go to a junk yard and see if I couldnt find a used chysler unit to play with.Mount it to the muffler with a hose clamp and see if it backs off quick enough.Youd have to modify the rod but that shouldnt be a big problem if you have a coathanger.youll find it on the intake right next to the carb on the right side.
