I would go electric. Definitely an upgrade, but frowned upon by purists that
may want to retain originality. I never put an electric choke on a Quadrajet -
assuming you still have the original carb. They've worked perfectly for me
on Holleys - and now on an Edelbrock.
You will need to run one wire, and patch it into a circuit that gets power
with the ignition on. The unit will need to be adjusted for pull-off and
for idle speed. The directions that come with a kit should be sufficient
for you to get through it OK. New choke tubes will avoid these extra steps.
I've been running a Q-Jet electric choke conversion for about 1 1/2 years now. The only problem I had is that it would quit working every now and then. I had 12V to it, but it still wouldn't open. I think I finally fixed it by removing the washer between the electric assembly and the housing. I am pretty sure my problem was a flaky ground and that should have fixed it.
The choke is always supplied with 12v. When it gets the 12v, the metal coil will heat up causing it to open the choke.
My electric choke has 12V full time (battery), plus 12V switched. And there's a tiny little black box that bolts to the intake manifold. I assume it's some sort of temperature sensor, and it controls the current going to the electric choke heater...and voila! It works!
You can get it from Summit Racing. Search for part number EDL-1932 -- and it's only $36.99.
Sorry for not looking sooner, guys.
As stated by others, mine has a constant heater - and the bimetal coil gets heated
and eventually pulls the choke off. Any other heat source would effect it,
but under normal conditions - not an issue.
Interesting to see one that apparently senses the manifold temp - and
adjusts accordingly. Huh - never seen one.