You raise several issues here. One is that the radiator isn't good for anything over 30#. As far as the AC lines wrapped around the fuel line goes. The single line system on the 96+ would work for that. Earlier lines return to the tank and are constantly circulated. But cooler fuel is a cheap horsepower trick from way back. But there is a trade off. To get cold out of an AC return line, it first has to be compressed and thereby heated and allowed to dissipate some of that heat usually in front of the radiator, which in turn will make it harder to cool. So it is kind of a catch 22