Rear end .02

[69NBC]

My project is well under way and I have been focusing on all aspects at the same time,except for the rear end. I'm now looking for a quick suggested direction to focus on rear end. 69 Camaro w/built LS1, not sure on tranny yet. Probbaly going to put in new rear leaf setup due to price. Currently have stock 10 bolt. Will it be strong enough? Should I build it up? Should I buy new 12 bolt? New 9"? New after market? etc...