Go to MyMopar. Download the 65 service manual, it's free. The tanks are on page 14-75 -- 14-81
Do some research. So far as I know, NONE of the A bodies (and any other Mopar from ?? 60--?? onwards uses a vented cap. (A body waggin's could be exception) I could be mistaken about some of the older models. The newer evap controlled ones are not vented in the operational sense, either. They are "pressure vacuum" (pressure relief) caps and they are a mess from about 70 onwards