Idle drop by 500 rpm?

Good of you to help out @RustyRatRod

Hopefully some of the guys looking in learned some of the diagnostic steps on how to go about this.

Over the internet diagnostics, no easy task.
Agreed George Jets! @RustyRatRod, That Brother has Helped me Alot, alot of Y'all Have, weather Ya know it or not! I was on FBBO when I built the 66 Sat. Propwash and Kim both helped me. Was along time ago. And the recipe for the 340 was pulled outta here, back then. From me Lurking! EVERYONES Help is GREATLY appreciated, DAG-NABBIT! ( Best Denver Pyle Voice-over )