Ed, You are very helpful,like JohnZ. While messing around with these cars for a long time I have come to know that internally muncies were all the same(other than gears), at least for a particular year comparrison. I guess what I was getting hung up on is that the AIM called for a different #, 797, on the L78 car and I could not figure out exactly why. My car,like I said has the original trans and rear. I do not have the original engine though. The car is in the data base and my info to Kurt reflects that. I have a correct date coded L78 that I will be putting in the car and I want the details of this car to be correct for my own satisfaction. I am NOT re-stamping the engine, but I want the car correct regarding correct parts for a L78 car. The trans. currently has it's original 356 tag on it. Nothing on the car appears to be tampered with and I believe it never has been tampered with and that is with good evidence and the fact I have owned it since 1980. In my pile of xtra parts, I found a 797 tag. I was under the impression that this is the tag that should be correct for the L78, but was not sure why a different tag was denoted. Again, just in pursuit of making car accurate. According to what you say though, the 356 tag would be correct. I kind of thought that was the case, based on why would it be different based on H.P., but AIM seemed to confuse issue and I did not want the wrong tag if AIM said that it was supposed to be 797. Thanks,B.B.