fuel tank questions

Guys, I see this posted sometimes, and there's a big factor here: OEM vs remakes/aftermarket on gas caps. Mopar caps from '70+ were partial-pressure caps, if you read the Allpar article it explains it better. The thing is those were only used on OEM caps. If you buy a remade cap/aftermarket cap those are all just vented caps. Way easier to remake them that way as that's whats readily available. Go investigate and see for yourself - even the primer exact replica caps are vented.

OP: Yes, get a new Spectra brand tank as those are very good quality. For a sending unit find an OEM or NOS one - all the aftermarket ones are garbage. If you're keeping your car original use the filler neck with vent tube attached. You may want to blow the vent tube out with compressed air to clean it and possibly add a small filter or screen underneath the car to insure it doesn't get crap in it over time.