Tanks, How-do-ya'..........

Tanks, How-do-ya'.......... tell 'em apart?
This is late '60s a-body tank from years ago I've had sitting on a shelf in the shed. Immaculate on the inside from what I can see from the fill hole. The sensor is toast showing infinite resistance throughout float motion and needs help. It's clean where the straps run too.
I understand there's a difference between '67 and '68/9 Barracudas. And that is what I need some education on (at this point) if anyone can help me.

Tanks in advance!
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