A buddy of mine just purchased 71 Z28 (he's been looking since I got mine). He checked all numbers at the time of purchase, except the auto transmission. The trans. pan has Turbo 400 on it and I showed him where to find the # on it this afternoon. The car has headers, so you couldn't get right in front of the stamped number but it looks like H1T03594. Does this # sound right. Thanks.