Yes, I used one back in the day. In the early-mid 80's, I had a '78 440 cop car with a 3310 that was my daily driver. My choke did exactly what yours is doing, so I added one of these gizmos.

They work, but the only way to tune it is to move it around on the engine - from areas that warm up quickly, such as a center intake manifold bolt, to areas that warm up slower. If you can find an area that warms up at a rate that makes this a match to your choke, you're done.

The reason I use a normally open temperature switch is for tuneability (is that a word?). You can change the resistor value (or use a rheostat), change the temperature rating of the switch, and move it around on the engine.

Once you tune out the pig-rich cruise on a Holley, your car becomes a cold-natured beast, huh?

Jim