Don't believe everything you hear. Had a used standard T5 out of a Mustang and put it behind a mild 302 in my 65 Fastback. Made literally hundreds of quarter mile passes with 8x26 Mickey Thompson slicks. Using nitrous on the launch. I broke 28 spline axles in this car, but the tranny held up flawlessly. This particular car needed an aggresive 11 inch clutch in it, because the best 10 1/2 in long style clutch would not hold it. Eventually I sold this to a guy who put it in a Jaguar with a Boss 302 and gave it no mercy. I seen him a few years later and he said it was just starting to grind when putting it in 2nd gear. They can handle a lot of abuse, but some people can break them. On a side note, I replace the T5 with a Richmond gear 5 speed, on the box it probably proclaimed "bullet proof transmission". Broke the input shaft the first weekend out. The biggest problem with that T5 is if you have a motor with a lot of cam and you don't have steep rear gears. The motor won't like it in overdrive. If you have steep gears, you need a motor that will rev 8000+ if you want to use first gear. Alternative set of heads for that 331 would be a set of Chi 3v's. I was a building a 331 with 3v's (185cc) for my Mustang, but decided that my Gurney West lake engine was still a pretty cool engine to keep in my Mustang. So I have these things sitting around now. Not sure what I am going to do with them, but I will probably finish building it sometime.
