The original '71 and '72 Passenger car Tanks are different than the newer ones. I would question how that or any aftermarket Tank would work before buying one.
I sold an original '72 Tank to an outfit for them to reproduce them, but I haven't heard if it is ready for market yet.
-Parting Out over 75 '58 to '73 Full Size Chevy Cars-
-National Impala Association
-Vintage Chevrolet Club of America