Hey folks...I've been working on and off for 10 years on this car and I'm ready for a fuel tank but I don't know if this car had a 4 vent or 2 vent(?) tank. I see the reference to the E.E.C. identifier but I don't know what that means. If I used a 4 vent, not knowing what it came with, and should I only need 2 vents, can I plug the others?