The Sun chart lists part 1115115 as the coil for 1967 327 275hp. Same for Corvette, Nova Chevelle and Camaro, with or without a.i.r.
For what it is worth, Primary resistance is 1.25 to 1.46 ohms. Card was printed in 1967, so I would hope it is the after 10-20-66 change.
I don't know that you will find a definitive source.
This page says 1115242 before 10-20-66 and 1115267 after 10-20-66 (for Chevelle, but should be same as Camaro).
http://chevellestuff.net/qd/coil_numbers.htm
Even the Sun sheet isn't always gospel. They got their info from GM and mistakes were made. For a 69 Z the Sun sheet gives a procedure to check out the thermo air cleaner mechanism. Probem? It didn't have one.