i have a 58 del ray 235 6cyl. the carb that is on it has an auto. choke the vac. line that comes off choke leads off behind carb under manifold but is not hooked or plugged into anything . i looked but could not see where it plugs into manifold, it is a rebuilt carb.,i don't believe it is the orig.did the 58 have auto. choke? if so, where exactly is the hole it plugs into thanks for any help

I might be wrong,but I thought there was a line from the choke to the exhaust manifold.I think the heat from the manifold goes through the tube and warms up the spring in the choke housing which makes the choke open up as the spring warms up.

All 1958 passenger cars had an automatic choke. The is a metal choke stove clamped to the intake manifold. A heat tube runs from the stove to the choke housing fitting on the carburetor. A slight bit of vacuum leaks around the choke piston and sucks heat up the tube. The heat contacts the thermostatic choke spring and opens the choke. When cold the choke valve should flap closed (after the throtle is opened slightly.) As soon as the engine starts the vaccum piston should open the choke slightly. As the manifold heats up the tume will bring the heat up to the thermostatic spring and after a few minutes the choke valve will be completely open.

i don't want to sound stupid but i didn't see anything on the manifold where it would attach. where would it be located on the manifold?

It was two sided and clamped to the front of the intake manifold (top of it) between the front and center exhaust manifold runners. If its missing you will see wo raised lines in the intake casting and its located between those lines or raised areas.
If missing you may be able to purcahse a universal choke heat stove from NAPA.

Here is a picture of the 1955 Choke expanded drawing. It is very simular to the 58 235. if not the exact same one:
note: Tube #8.964 and stove #3750 and the strap and screw that holds the stove on the exhaust manifold. The tube uses a nut and ferrel to connect to the choke, and the plain end just sticks into the hole in the stove.