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Would not be correct as pictured for C-1 due to the incorrect configuration of the bottom of the high tension tower. this is covered in most of the judging guides, I believe and has been the subject of past articles in the "Restorer" magazine.
Chris,
Aside from presence of the the shoulders that Bill mentions there are other variations from originals. The location of the 091 embossment appears to high and the terminals are different from the originals.
NCRS member, Ken Kayser wrote two articles on coil running changes that specifically address the '091 with the first article appearing in the Winter '95 edition of Restorer magazine. Here are comments based on what Ken wrote as well as what I've observed.
(1) There was a running change to eliminate existing locking washer 'tang' holes on the primary terminal post mounting pads. This version of the coil resembles a LATE (post 1974) era service replacement coil but real McCoy service replacements exhibited circular lines of 'flash' where the tang holes were plugged....
(2) This one has the anti-swivel shoulders cast into the high tension tower characteristic of a post 1961 '091 coil.
(3) As mentioned by others, this one also appears to have the TALL (3/8-inch) primary mounting studs ws. early SHORT (9/32-inch) mounting studs characteristic of a post 1961 coil.
(4) The identifying emboss on the side case looks 'funky' to me in terms of font and placement. Delco DID move the emboss position down by 2.5-inches from early original coils (post 1967), but this one doesn't look like the ID is located in the correct 'high' position....
(5) The upper Bakelite looks 'funky', but that could be an internet/picture resolution issue. Factory original tooling was based on a HEAVILY chrome plated mold that produced the smooth shinney finish naturally without the use of paints/glazes, Etc. This one looks 'rough' and it'd be interesting to see how it reacted to a daub of lacquer thinner!
Bottom line, when looking for an '091 coil for your Corvette, you need to know what YEAR car you're shopping for as there were running changes the judges know about and use as a yardstick for originality/authenticity. You can't simply lump all '091 coils into a common 'basket'. Plus, getting/reading Ken Kayser's articles (you'll find them on the Complete Restorer CD ROM) before you start to shop, helps a BUNCH!
I was talking with the fellow from Goat Hills Classics several years ago at Carlisle and he was describing the process to make the repro coils. He stated that they were using used bakelite insulators from donor coils which may help explain the used appearance of the bakelite, or that the coils may have various vintage insulators.
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