I copied this from a post Danny made. John left this reply. I am pretty sure i had seen them with the capacitor but i didnt find it in the AIM. Thanks!
coil bracket with the "notch" is not unique to the Z/28; originals don't have the notch, although the eBay sellers want you to believe they did, so they can claim they're "rare". The one in the photo is clearly from another application, as it has the screw to attach the radio noise suppresson capacitor, which was never used on a '69 Camaro.
I just checked mine and it does have the notch as I have read and been told that all ZL/2 hoods required a different coil angle and therefore a different coil bracket compared to the flat hood cars. Can anyone confirm this as being correct? My car is unrestored and as far as I know it is the original bracket along with many other original components still on my car.
Also, mine does not have a capacitor and does not appear to have any threads where one was ever installed. I would have to remove it to be absolute.