How many more options do you want?
Any other options start becoming big money and/or challenging to install.
I once saw a guy that installed a Chevelle rear end. It looked like alot of work. He installed the swing arms and everything. He built gliders for a living and was a master fabricator.
The cheapest & easiest by the way would be to use a 68-to early 80's Camaro/Nova rear end.
