gas cap/air cleaner assy/tailight lens 1964

As I recall, the kick down linkage is from the bar through the firewall down to the PB 904.

Is that how the throttle on your Holley is actuated? By a bar (from the gas pedal) through the firewall?

If so, I believe I can help you out.

Send me a P.M. and I'll get you some pics.