Rear choke pull off vacuum connection?

[83silverado400]

Hi, can anyone tell me where the vacuum line on the rear mounted choke pull off on a quadrajet carb hooks to , is it to a carb port or manifold. Thanks

 

[Green79Scottsdale]

IIRC, it is to a port on the carb baseplate on my truck. I don't have any pics or my truck to verify however.

 

[83silverado400]

Thanks