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You're missing some letters here, 6015 is the part number for an engine block. The "E" is the tail end of the prefix. The ED15 makes no sense, as a suffix, generally there are anywhere from one to three letters and no numbers in the suffix
Makes no difference whether or not it came out of a car. This is the engineering number, it in no way tells you what vehicle it was originally installed in at the factory. It could have come out of a pickup or van as well as a car. What that "A" in the prefix tells you is what vehicle line the engineering costs were assigned to, not what vehicle it was used in. That block would have been used in eny of the Ford/Merc/Lincoln vehicles that were offered with a 351W from 1979 until there was a need to redesign the 351W engine block in a succeeding year. That means it would have been used for many years afterwards. E7TE heads were in production from 1987 til 1997. C8OE 302 rods were in production from 1968 til the early 90's.
Decoding Ford casting part numbers
Here is a link I found. I narrowed it down to a LTD II. I has the V-belt design like the engine that is in my truck. Some of the other cars in 79 have the serpentine belt design.
Like I said before, the "A" in the casting number does not tell you what vehicle the engine was originally installed in at the factory. The ID tag affixed to the carburetor would tell that. All that "A" indicates is the vehicle line the engineering costs were assigned to when the block was designed. READ the text of the article you linked to, it tells you that in it. The 87-95 GT Stangs had E7TE heads on them. That is only one instance of many that reinforces what I'm telling you. Check the casting numbers on that same 5.0 block in those year's Stangs, you will find E6SE in the prefix along with F1SE in later blocks. Yet, the engine came out of a Mustang not a Thunderbird.