I've searched here for a few days now and know the answer is here somewhere but have not really nailed down ALL of my options on a rear end swap. It sounds like the 2nd Gen is the best option, but what are my other options if I can't find a 2nd Gen? It would be great to find a Posi with the optimum gears, but not a necessity, just looking for something other than 2nd Gen that can be slightly modified to fit my 68. Nova maybe? Anything BOP?

I would change the gears and insert a Posi unit, but rust has got the best of mine.

Thanks in advance for the help.

Jim at jdrace can give you every combination that would work in your car. He made a post in the parts for sale forum and his user name is Monza and contact info it listed. His website is jdrace.com Here is the post https://firstgenfirebird.org/forums/ubbthreads.php?ubb=showflat&Number=279541#Post279541 He has helped a a few here including myself and he knows his stuff on rear ends and is most helpful!

Nova is a bolt on, second gen needs the perches re welded in position. Nova is 1 inch shorter in width. My vote is nova rear, and that is what i did.

What year models Kyle?

You can also go with a brand new Moser 12 bolt chebby style. Prob pricy, though.

This explains it all for first gen Camaros. Same rear axle as ours except the camaro is 1 inch shorter in width as well. A perfect fit to the Nova. http://www.camaros.net/forums/showthread.php?t=188370

Here is a portion of it.
"68-79 Nova rear could be any of the following: 8.2, 8.5, 7.5 or 12 bolt.
68-71 were 8.2 or 12 bolt
72-74 were 8.5
75-79 were 7.5 or 8.5

Nova rearends are the widely proclaimed to be the"bolt-in" swap for 1st gens. However some Pontiac Ventura, Buick Apollo & Skylark and Oldsmobile Omegas and 77-79 Cadillac Seville also got the 8.5."

Mine is a 74. 8.5. Count on having to change your axles as well. In my experience they are usually worn at the bearing because the serve as the inner race.

Much appreciated Kyle!