Yes that seems to be my issue as well. I think my replacement tank was for a 69 and the hole is too far forward for my 70. It looks like to get rid of the 70 EEC 4 vent system, a 72 tank fits and the hole is in the correct location. I dont mind running the single vent tank but i am trying to figure out if I need to use that single vent in the tank or add a vent in the filler neck. Whichever is cleaner and better to do is what I would like to go with.