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Can't tell from your numbers. The first number of the VIN should be the year. Your first digit is a 3. There are no 63 Mustangs. Looks like a 2V 289 though.
I think it is a 289.. I couldnt tell much at the time but I know it has a V8, and I think its the original.. As for the date, check this out.. I went here: http://www.ponysite.de/news_1.htm
and found the date code of 03J on an "early 66"..
Yeah, it's a C code 289, but the rest of the numbers don't make sense. If you try to decode with those numbers you get a 73, and we know damn good and well it's not a 73.