Al looking at your pic, and with the more square type nose of the barracuda. I would suggest moving the radiator a little forward, then mounting the cell between the radiator and the block. As you know it has to be within the frame rails so more tubing may need to be added there.

the other option as already proven is the surge tank from Rons, its small and can be mounted in various places up front, just has to be above the pump to keep it primed.

I have known ONE, I say one, car that had rear mounted and rons set up, it worked great for him. But have heard too many other horror stories.