'73 Vette Q-jet question----Eric? Help!

[Verne_Frantz]

Well, I got myself into something to help a friend who did me a favor and I'm rebuilding his '73 Corvette Q-Jet. I ran into something that might indicate that the carb might have mis-matched components, namely the lid. When I got the carb it was missing the link that goes from the vacuum pull-off to the secondary air valve on the air horn. Every pic I"ve seen of a Chevy Q-Jet shows a piece of linkage on that valve with a slot in it for the link, but this piece has a lever with a single hole (like a Buick perhaps).
He complained that when he reached 4-gear under WOT that it just fell on it's face. Well.....no wonder, it was running on a little 2-bbl!!! The secondary air valve never opened!
So, my question (and I hope Eric can help, or anyone else who has a knowledge of that correct carb)is ............... is that carb supposed to have a slotted lever on the shaft for the secondary air valve or a captured single hole? IF it needs to be a slotted type, can someone provide a source for the correct lid?
I should just stick to 4GCs and AFBs which I can do in my sleep! I want to make this thing as nice as it can be to return the favor for him putting up all the shelving in my new shed.

Sure would appreciate some guidance here........

Verne