My car was a late build with HEI. I bought it about 30 years ago from the original owner. I was confused when I looked at it had an HEI and the block code didn't match anything in the 1974 shop manual. I crawled underneath it and the VIN on the block matched the VIN. The owner told me that late 1974 builds had HEI distibutors, but I didn't quite believe that. I had two 1974 SDs that were built in late May and July 1974 and they both had point distributors. I bought it, later came across a shop manual supplement that covered the late 1974 builds.
I still have my car, and it has the original radiator support in it. I can take a picture of it if you like. I never paid any attention to whether or not it was different from earlier cars.
Mike
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