Join Date: Mar 2002
Location: Austin, TX, USA
I've only dealt with the single terminal 400s but here is a suggestion. Use a digital volt meter to measure resistance between each terminal and ground. I'd guess the kick-down solenoid would give you about 20 to 40 ohms of resistance (give or take). The other connection is probably a pressure switch if it's used for spark control as you suggest. If so, the switch terminal will measure near 0 ohms or infinity depending on if it's open or closed.
68 Coupe, 350 w/ Edelbrock Performer RPM heads, cam, intake, 700R4, Dave's small body HEI