If were to go the full frame route, I'd probably have to go with an Art Morrison Max G.
If you are really interested, here is one that Kenny Davis Hot Rods has for sale that a customer is no longer going to use.
http://www.pro-touring.com/forum/sho...&highlight=max
Here is a link to an album of one of Art Morrison's customers that put a Max G under a '69.
http://www.artmorrison.com/gallery/v...9Camaro&page=1
If you aren't interesting in fabbing all new floor etc.. Schwartz has a bolt in full frame option.
http://www.schwartzperformance.com/