tank venting question

Thanks for the reply. I forgot about the post-'71 fillers going through the body from the outside.
I can't reuse my '71 filler tube as it was nasty and rusty. I soaked it in vinegar for a couple of days.........got rid of the rust but ate some pinholes in it where the bad pits were. :angry4:
I have a '67 and a '68 parts car. I'll take the filler tubes out of them and see if they are any good. I may have to come up with an early cap. My '67 doesn't have one and I gave away the one that was on my '68. Are they available at the parts store?
Dallas