1969 Barracuda Carb Suggestion Needed

Correct! The one on the rear is a full time vacuum port. (Or there is always vacuum there.)
The on on the drivers side, front of the carb is a "timed" port which can be take. As part time. LOL
That is the one for the distributor.
This is for the Carter & Edelbrock copy carbs.
Your Mopar wants the timed vacuum port.
Okay sounds good. I got a 2 foot tube and hooked it up, and I removed the other caps you told me to. I'll take a pic when I get home and post it to see if I did everything right. Lol