throttle shaft return springs, '73 round top su conversion

[Zsomething]

I finally got all the old gaskets off the round tops that were bolted to another manifold. I hooked up the linkage and I was feeling good until I realized that things don't match exactly right.

First, I realized the screw that limited the return motion (attached to the egr) does not hit the pad on the firewall throttle (not sure how to call it) shaft. It looks like the pad is supposed to oppose a screw. But, it doesn't match the flat-top assembly and I don't know what the earlier style looks like. Is this a problem? The picture below looks like it has the flat-top stopper. What is the function of this screw?

Second, when I fiddles with the assembly a bit, I realized that the butterflies don't return to closed after releasing the throttle. After reading this thread http://www.classiczcars.com/forums/showthread.php?t=25818 and this thread http://www.classiczcars.com/forums/showthread.php?t=17320&highlight=fast+idle+screw, it looks like I am missing return springs. My manifold more-or-less looks like this one from the thread http://www.classiczcars.com/forums/attachment.php?attachmentid=17997&d=1177913434, except I don't have the springs.

Can anyone suggest a quick-term and/or long-term fix for either of these problems?

[Zsomething]

Bruce Palmer answers some of these questions here: http://www.classiczcars.com/forums/showthread.php?t=27596