AVS Choke Doesn't Work

Good questions. My intake manifold No. is 2531915. I appears to be the 1968 340 intake. The number I found for a 68-71 intake is 2531914. I found these on http://www.mymopar.com/intakecastnumb.htm. I asked the guy I purchased the car from and he thought the 68 manifold would have been used on the 69. When he bought the car it didn't have an engine, so he bought this intake and carb at a junk yard.

It has a thin gasket. I asked a carb shop and they said this is correct. I also held up the carb a little and it didn't seem to make a difference.

I am really stuck- kind of like that pesky linkage.