it could probably be straightened, but they're pretty cheap, and easy to come by. i gave a set away last year and still have a set in my garage.

plus if you change the rear suspension to coil spring, you wont need it.

here is another site with f-body coil kits:
http://www.hotrodstohell.net/truckarm/truckarm_index.htm
i dont know how it compares in price, but the install looks like it might be a bit easier, with the same basic result. (as long as you are'nt all out drag racing)


if you're still worried about bends, and want to do a bunch of measuring on your frame, the dimensions can be found at
http://1968firebird.org/
under 'service manual', 'body and frame mounts'
i think if the shock mount looks okay, and the front bracket looks ok, you're fine.