[max_torq]

It's just that by the time you get to the TD their could be 2l pintos in 6 cylinder shells, and other cars could have been subject to modifications post factory. It is probably necessary to avoid the 4 cylinder TC, and there are some additional mods in the TD compared to the 6 cylinder TC that may make them more suitable for your purpose. The TC uses toploader and the TD single rail boxes, they are about the same size, there may even be a variation for autos; I've never seen one. You may be aware that the Cortina uses a special variation of the single-rail 4 speed with the shifter closer to the bell.