Joe, You will need a 3 series carrier for 3.08, 3.36 and 3.55 in an 8.2 10 bolt rear.
The 3.55 was listed as a stock 69 camaro rear option "BN" code for a 8.2 non posi. 3.36 "BD" was the highest stock gear offered for a posi 69 camaro.
I will be doing the 3.36 posi route on my 8.2 rear, but there is no inexpensive way to re-gear these rears. Just have to bite the bullet. The costs of work it takes to set up a 10 bolt is the same as the 12 bolt. The cost of the gears/posi are very close. it's the housings that make the price difference.
There is a difference of opinion about the strengh of an 8.2, but if it's a mild 350 that you don't do day-long burnouts with, it should last a while. There have been quite a few posts on the subject, please do some searches.
PS, did you ever get your door mech hardware?
69' SS-350 ragtop, M20, 3.55 posi. Totally Disassembled & in boxes (I'm working on it!)
69' Hugger Orange Z-21 ragtop 327/PG, Driver