Join Date: Jan 2000
Location: Island Lake, IL
I didn't have quite the same problem, but maybe I can offer an alternative to the throttle switch.
My problem was the switch kept pushing out of the retainer at full throttle.
I piggy-backed the wiring to the TH400 kickdown switch. If you have a manual, Summit sells a NOS activation switch that mounts to a Holley that will do the same thing - close the circuit at full throttle. It depends on how original you want to stay (since your puting a cowl hood on a '67, I assume your willing to budge on originality).
Hope this helps.
'69 RS/SS 502