My 65 273 Barracuda is exactly the same as pictured above. I think the only way you could could connect it back to the tank is if you had a vented Gas cap, but don't see a reason to do it if the line is vented to atmosphere.
I previously had a 64 225 and it was the same as well.
I would call these guys http://www.rtspecialties.net (570) 388-1082
I know they carry the ones for later A bodies with the dual straps, it could be the same J bolt, some on here might know if the later J bolt will work.
360scamp, there is some light circles on the cap from machining I just took some 600 wet & dry and the lines come off.
The gas cap I got is a real nice fit.
two thumbs up for damraider
If the fuel in the tank is good and the pickup is sitting in the fuel is should suck up some fuel and try to run a little longer I would think.
Pull the tank out, it's not to bad of a job if you have the back of the car sitting on jack stands.
A single strap should be holding the tank in place. There will be a single wire for the sender and a small gound strap. Undo the tank strap then wriggle the tank out of the filler tube. I think the cheapest place to get a tank is rock auto.
I think if your carb has pieces missing I would go...
I would think that if you don't need the clean air (or charcole canister) I would just get a regular tank. When I did the 71 Demon the tank came with the 4 vent tubes and I just put plugs on 3 of them.
I agree, I would defiantly try a little stiffer spring in the secondary's. If vacume is lower than before the cam swap. which is what I would expect you could drop the power valve a little also. But like Adam said a little more converter is s in order, but that probably isn't your maiin problem...
One thing to remember is, when you bolt a pump to the block, it's like a heat magnet. The pump is as hot as the block is. When you bolt on a electric pump, you save a lot of heat being transfered to the fuel. Probably not a big deal for most, but it's fuel for thought!
Just checked my Chrysler info book, 72 - 76 A body 16 US gallons. 1971, 17 gallons. 67 - 70, 18 Gallons. I never knew this, good thing somebody asked! I didn't even realize the tanks were different, or my book is wrong.