Connect/adjust Quadrejet electric choke - need info/advice

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Just changed to the later model electric choke version of the Quadrajet (Edel 1904) - never had an electric choke - and need some overview info.
1. I assume that the "electric" aspect serves to close the choke plate and that a heat source from within causes the adjustable spring to open the plate as the engine warms up. (If the choke operation - closing and opening - is all electric, please straighten me out here).

2. Intend to provide 12v to the choke mechanism from coil connection (or similar) but see only one connector on the choke and assume that to be the positive. What need one do for a ground?

3. No doubt the choke spring/opening aspect will need to be adjusted to this engine - and am assuming that should be done with engine at op temp, but could be wrong. What is best procedure?

if you want to save typing and cite a good post/source, that will be fine.