Anyone put a fuel cell in a 64-66 Cuda? Bad idea? Fumes?

.. For many many years, lots of 'murican pickup trucks had the tank in the cab behind the seat..

Oh yeah, I had 2 buddies go get a 396 C10 shortbed from North Dakota, drove it back to So. Cal with a leaking gas tank that was IN THE CAB! They said it wreaked of gas the whole trip back and had to drive with the windows down the whole way. They found out the tank had a split seam on the top so it never leaked fuel, just vapor. That is unbelievable design work.