The main difference is the spring perches are taller, to make up for the taller spring pack. The u-bolts are also longer. Any set of multi leafs from 68-81 will bolt in. I would also add some polyurethane bushings, especially if you plan on adding slapper bars. The shock p/n is different for multi's also, due to their different spring rate.
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Texlurch - 68 Camaro (Just a little ol' LT1 with a Hot Cam, I SWEAR

" a little spray never hurt anyone, spank you very much!"
or the old standby:"I came here to race, not sell real estate. You ain't scared, is ya?"
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Texlurch - 68 Camaro - Twin Turbo, Twin Intercooled LT1
DFI, MSD, Aeromotive, BBK, NX, LT4 Top End, Forged Bottom End
(stock motor + 6psi = 405 RWHP, 513 RWTQ

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