I am finally getting around to the transmission on my tbird project.  I am going to do the FMX conversion.  I am familiar with the other options but already had an FMX laying around and trying to stretch the budget.  One question is around the torque converter.  Of course the 55 has the air cooled torque converter and was wondering if its okay to stick with that converter or are there advantages to switching to a water cooled torque converter?  If there are advantages I assume we would be talking about one from a 56 or 57 Tbird?  Of all the things on the car I know less about the torque converter than anything else so any advice is welcome.