Fuel Tank question

Hi everyone
Upon discovering my carb's float bowls full of crap and other garbage like chunks of rust ,even with a filter this crap is getting into my carb and it's obvious I need a new fuel tank.My question is I've found a new fuel tank with 4 vents for a great price but my 72 Duster I believe has only one vent.Can I use this 4 vent fuel tank and cap off the remaining vents?I also plan on replacing pretty much the entire fuel system.Fuel lines,fuel sending unit,straps,any seals I need,fuel filter and even the fuel pump(which I'm pretty sure has crap in in as well).
I called around to possibly have my old tank cleaned and sealed but eh,the only shop around here that does that charges more than what a replacement tank costs might as well just replace it .