Thanks for the help on the 429s. I have just purchased a 72 convertible. I have a 351C or 400M with a newly rebuilt C6 transmission. I also have a guy who said he would sell a 69/70 429 with a C6 transmission bolted to it. He also said he had put a shift kit in the trasmission. He said this 429 has about 364 hp stock. He also said that if it was him he would bore and rebuild it. The asking price for both is 1000.00. I am looking for horsepower and speed. I would like the advice of all cougar experts on what I should do. Thanks a bunch!