not sure what the vented caps were like in the mid 60's, but the vented caps used for 1970 cars were one way only, IN. gas or air wont escape out on launch or any other time unless the caps membrane went bad.
i use a 1970 non vented tank in my 72 since i didnt want or care about the EEC set up and am not using a factory return type mech pump. i did add a tanks inc vent with roll over protection but didnt notice any difference in driving before i added it. with the robbmc pickup, i have always kept the tank full at the track, running low 11s it has never dumped a drop of gas on the track.
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