Easy Holley Question...

one is +, the other is a ground.

The choke housing consists of a positive and negitive connection. The lean and richer markings have nothing to do with the electrical connections. The lean and rich indication mean that if you loosen the black plastic housing and rotate it to the lean direction the choke will come off faster vs. the rich direction will let the choke stay on longer. The negitive terminal on the choke housing will need to be grounded at the closest ground available, usally under the lowest choke housing screw will do fine.