Group 9.750 Tachometer Assy
67 Camaro w/console gauges (327), (1st design) - 6468244 (stamped 6468244)
15-41 ring and pinion is a 2.73 ratio and the PW verifies this as being a 2.73 10 bolt open rear end, assembled on October 6th, 1966. This is further verified by the casting number (3894859). The date on the Ring and Pinion of 9-66 (September, 1966) matches the stamped date (1006), so it's probably original to that housing. However, your 09D assembly and the October 6th axle dates don't really line up very well. However, if your car was started late in the week, it's possible you could have gotten an October 6th rear end. Here's the 1967 Calendar
and you can see that the last day of 09D was either the 29th or 30th (depending on if they worked a Saturday that week), and October 6th is the next Friday, so it's possible, but it would still be hot as they were installing it!!!
Your car isn't an SS, so it's either a 327/210 (base engine) or a 327/275 (L30). The 68 Muncie or course isn't original to the car, but what's the numbers on it? (I'm missing mine!!)
Check your Trim Tag and post the numbers. We should be able to narrow it down for you.