I havent yet. Your thread reminded me to order one and install it. Currently my vent line is just connected to the vent line nipple on the charcoal canister. In addition to the rollover protection and venting, the valve also serves an overfill purpose.
here is a thread where it was discussed before.
I am still restoring my car and it hasn't been on the road yet but I ordered the tanks inc one and one from amazon (from linked thread above) to see which one I like better. I'll install whichever one I like better next weekend.
Part of what makes this seem like there is conflicting information is there were quite a few changes to the vent/evap system in a short amount of time. for example 72 had a 1 year only charcoal canister with 4 nipples. 73 changed to a 3 nipple canister. pre 72 was different altogether. In the span of 3 years there are 3 different setups. Bottom line is, you need to focus on the 73 system and its nuances and vent according to what they did in 73.
