John,
It's late, and I just got back from doing a little tinkering myself - I looked everything over again and it came to me - like you say. Fact was, I was missing that return spring on the back of the bell crank (where that skinny arm sticks up) and was trying to mount a return spring forward of the carb, with an anchor point near the front most intake manifold bolt. After looking through a box of goodies, I found a return spring that was good for length and tension, and mounted it to those attachments point that you spoke of. After an adjustment or two, I got WOT with a full return to idle.
I took it for a test drive. Can I say - it was a little unnerving at first? The previously mounted 2 barrel was good, but not this good. I could burn rubber with the 2 barrel, but with this 4 barrel...The response now is utterly awesome. How does a Fordo hook up that good? I do believe I have to adjust my kickdown rod a little more - seems that when I got out on the highway and nailed it, she stayed in second gear a little too long. If memory serves, I need to "lengthen" the rod by adjusting the clevis receiver up, correct? I know it will take some trial and error, but it should work. One other thing I noticed, is that on the road when I went to full throttle, she took a full second to come back down after I let off the pedal. I assume this is because I painted the entire bellcrank (were they painted from the factory? I don't think...) After a little lubrication, it was already working better.
The pcv setup that I installed was one - a snap, and two - really sealed up oil seeping as far as I can tell. Do those things really make that big of a difference? I used a valley pan that had the threaded hole and baffle in the rear, a pcv adapter (I guess from trucks in the 60's?) that had a 1/2" spout on it, an inline pcv for a 302 small block, and a metal line also from a truck motor that brings the pcv from the rear of the pan to the front of the carb (looks stock, anyway). I think it works very well.
thanks for all of your bits of wisdom. One of these days I have got to get up to Columbus!
Daniel JessupLancaster, California
aka "The Hot Rod Reverend" 
check out the 1955 Ford Fairlane build at www.hotrodreverend.com