Steve, first an original 327 2bbl carb did not have an electric choke. there was a bi-metal spring on the manifold with a rod. The rod actuated a cam which the fast idle screw rides on. screw head should face the front of engine.
sorry, Steve, did not read the "not" The bi metal spring has a range (hot/cold), you need a cover!. the rod and cam also have a range (choke closed/open). the length of the rod is used to match these ranges, so when the spring is cold and you hit the gas, it closes the choke. If it does not, you bend the rod until the choke closes when the engine is cold and you hit the gas pedal. Then you need to adjust the fast idle screw when the choke is closed. there is also some adjustment with the vac unloader. This info should be in the tune-up specs section of a chiltons, motors, etc.
When I open the throttle the choke does close and when car is started the choke pull off does open it up some. I have ordered a set of carb gauges that should be in soon.
A friend at work welded the heat riser open years ago, not sure if that was a good idea?
Where is the manifold cross over located, is that the hole in the front of the carburetor and manifold front base.
The manifold x-over is another opening between the exhausts that go under the manifold. When the heat riser is closed, it forces the exhaust to the drivers side, heating up the manifold and bi-metal spring. It can work without it, just takes a little longer to heat up.
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