OK fellas, let me try to catch up here....
First.....to answer Dusterdude's question: no, I have never run the car hot...it ran fine for the longest time, until this started happening.
Second.....Steve, this is what I'm running, in this order (my son wanted yellow valve covers...don't ask, lol):
This is the stack....
Here's what happened when I tried the paper trick:
Under the front of the carb: couldn't pull it out
Under the driver's side: couldn't pull it out
Under the rear of carb: couldn't pull it out
Under the pass side of the carb:
pulled out like it was oiled
Hmmmm....so, I grabbed the spare 1406 and tried the same thing, and got the exact same results.
Then, I took a steel rule and placed it across the intake holes, pulled it slowly, and it drags/scrapes across all 3 surfaces evenly (both sides and the center divider)...plus, it does not 'rock' in any spot when I move it.
One question, though: I noticed in my photos that I have the carb studs located in the inboard holes...would it make a better seal if I moved them to the outer set of holes on the manifold?
Rob