Should be no need to go to a 70 model tank. You can eliminate the ECC (Evaporative Emission Control) under your back seat and use the connections on each corner of your tank as a vents. Not sure how your plumbing is configured (return line or not) but you should consider a sending unit from RobbMc Performance with a 1/2" pick up. Might want to consider a return system to avoid vapor lock and / or pressure creep at the regulator since you are doing the whole system.Hi everyone, I am ready to order up my fuel system and have a couple of questions. First off my motor is a 383 stroker that is fairly healthy (513hp, 506tq), I am running a mighty demon 750 carb and a holley 110gph mechanical fuel pump. My Chevelle is a 1972 and has a charcoal canister and emission system under the back seat, my original fuel tank has two lines that look like a vent or breather line (one located at each corner of the tank). Here is my question is there any way I can eliminate these systems? I want get rid of the charcoal canister and unhook the system under the back seat, can this be done? I was wondering if I could just use a fuel tank and cap for a 1970 Chevelle. I have been told it can be done but I have to have a way to vent the tank. Just so everyone knows I am ordering a new fuel tank, mounting straps (and insulation),fuel lines and cap and sendin unit. My main issue has been trying to eliminate this canister and still have a safe and proper vented fuel system, Thank you for your input.