Frank,
Thanks for your help. I think other folks probably thought I was crazy with my description of the solenoid. Before this vehicle, I had only seen the solenoids that automatically energize to maintain idle when the AC is on, or as described in earlier posts, stay on all the time and then shut down to slow the engine and prevent dieseling at shutdown. I've put HEI on the van and was really shocked when I couldn't find a traditional ported vacuum outlet on the carb. All three ports are more like manifold vacuum with a strong "signal" even at idle.

marshall

If it ain't broke, It ain't mine.