Whether or not you need to bother would depend on your torsion bars. If you're not planning on lowering the car a ton, or if you're going to run larger than 1.12" torsion bars, you may not need the whole 1" of additional travel.
I have the 1.24" FF bars, Fox adj. shocks, and an 18x10 wheel.
I just have th suspension and engine/trans mocked up on a k-frame dolly so I'll have to wait till the car is done at the chassis shop to mock everything up.
