David, thank you for your advise. As it happens I have now reached the age of 70 ...but I am in denial.!!
The MG TC I have rebuilt has a competition history but it now has a supercharged engine built to fast road spec. The car also has a higher final drive ratio and a 5 speed box. Uprated steering and brakes etc etc. so you get the idea. I don't like to dawdle but I would want to fit an overdrive. I had one on my Triumph GT6 and wouldn't really want a 4 speed box without it. It would also give the engine a longer life. Thanks for the tip about the 405 diff.
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