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

Get a stock tank and modify a top corner.
That's actually a really great idea and a guy on this forum had success with this in a dart. Unfortunately, with the older cuda the best corner for the pump places the hump past the trunk and forward a bit into the rear deck. A huge cost savings but didn't like the idea of the top of the fuel pump being in the travel area (even with a small fabricated box to cover it)