Rear gas tank question

[Chevystep]

I'm fixing to bolt up a 69 Camaro tank in my 66 longbed step with a license plate filler door. The bed wood is off at the moment and this seems like a good time for the install and getting the tank out of the cab. Question for those who've done this and ideas from those just in the know....Should I put a vented sending unit in it and a non vented cap to possibly eliminate slosh out the filler neck on acceleration? I know Camaro's and several other models came with this gas tank set up, so is this "acceleration slosh" even something to worry about? Seems like the tank needs venting one way or another, so it's either cap vented (acceleration slosh again) or sending unit vented where a long enough hose and vent valve would work.
Clear as mud, right? Opinions?