Stop in for a cup of coffee

I would go for the four speed car just because it is mostly original and would worth way more done. Patches are a PIA to get for the floors, tried a valiant pass front patch did not work out great. I have the torsion bar section on the 66n I can cut out was just looking at it the other day, has one rust hole just on the pass side of the hump I believe but the rest is solid. Yours if you want the section you need.
I have the same rust under the back seat on the pass side on mine actually a easy patch. Just have to find out where the water got in to cause it.