This is one question we just can't answer. Why would you wait?
It took a while to take time and install the TKO 500 to my '67 Corvette. I did it yesterday and now tested it for the first time. It is better than expected and the only question is why I waited 5 years? Old Corvette is now totally different and very nice car to drive. Almost too easy compared to the previous M20 :-)
Thank you for the good customer experience when I bought the trans and thank you for a very good transmission!