Slant Six Chokes vary in design from early 60’s to 80 but the OEM originals generally are suffering from the effects of heat and corrosion by now. A Region member recently pointed out difficulties the Dart Slant Six Choke was having and how it was causing excessively rich mixtures. The factory OEM featured an adjustment nut that required removing the choke to get to the nut to make change from lean to rich or vice versa:
Some are having great results replacing with an electric choke that fits nicely and controls the stage choke opening very accurately during the warm up period. The Slant Six Forum has listed the 3 model types that cover the Slant Six Chokes years of plenty:
http://www.slantsix.org/forum/viewtopic.php?t=12996
Generally the early year one bbl carbs used the 1231 electric choke, later years around 73 & up used the 1234 electric choke, and the 2 bbl carbs need the 1232 electric choke.
The electric choke kit includes a sensor which mounts to an existing drilled and tapped head protrusion. Also included is a housing control unit mounted to a bracket that bolts in the same location of the original OEM choke stove housing. The included link snaps into the carb link similar to the way the OEM link snapped in with a new enclosed retainer clip.
Sometimes a hole has to be drilled in the bracket to get it to match the manifold stove housing hole pattern. A 65 and earlier Slant Six may need the extra hold drilled in the 1231 Electric Slant Six Chokes. 12 Volt power is tapped from a handy ignition key switched location such as the ballast resistor as originally mounted on the firewall.
1231 Slant Six Chokes mounted on a one bbl manifold look similar to this when viewed from two different angles:
1232 Slant Six Chokes mounted on a two bbl manifold look like this:
There is a comparison of the 1231 and 1234 choke in this video:
Setting up the Electric Slant Six Chokes starts by trying it out from a cold start with the indicator adjusted to the normal marker. Then a decision is made to lean or make the choke richer based on how fast the choke opened for your conditions. It may take several tests to get it spot on however once set you will be a happy camper with the reliability and repeating accuracy of these Electric Slant Six Chokes. You will find the electric choke adjustment method to be more precise than a factory OEM choke and requires less effort since it does not require removing the choke from the choke stove housing (which the OEM requires for an adjustment).
There may be several sources for these Electric Slant Six Chokes including CarbsOnly at:
http://www.carbsonly.com/carbs/carbschoke.htm
I have also found these on EBAY using the model number to do the search.
Since carbsonly doesn’t seem to list the 1234 choke as of this date EBAY may be the best place to go for that particular model.