Great Q-Jet tips there!
Have you checked out Cliff Ruggles new Quadrajet book? -
Here's a link to his book:
The book is fantastic, he does a great job explaining how the Quadrajet works, how to rebuild them, and how to build them up for performance. This book is much better than the very good Rochester Carb book by Doug Roe.
Cliff is the guy who has built up the qjet's for Jim Hand's winning Pontiac drag cars.
Here's Cliff's '73 Ventura, which overlaps the '74 GTO discussion: