72 Demon starts bogging sporadically once warm

Markzilla88 said

My only concern using the same tank is that he crushed 3 of the 4 vent tubes...)

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As you can see from the drawing, with the separator gone there is no other choice but capping or plugging.One vent should be enough.IIRC that 4-corner system was only a 1 or 2 year deal. I thought it was only found on E-bodies, but I guess I was wrong.
That line going to the front, dips down somewhere close to under the rear seat, and I have seen it rusted solidly shut there,from the inside, and so, not venting at all. Mine was only a 3/16 line