I am looking at a 1995 rear end with 3.42 gear ratio. Will this rear end fit my 1968 camaro?

it might fit, if you weld the mounts on. i have no idea how wide they are. but, once you have it in, you will have a smallish 7.5 ring gear- smaller than the 8.2 that came stock in older camaros, but i think the new rears are stronger than the old rears.

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1971 Nova(looks like 69 camaro from underneath!)
355sb, vortec heads, HOT cam,T-10 tranny, 3.70 gears 16X8" IROC wheels
see pics here http://community.webshots.com/user/novaderrik

the early Camaros are 54.25 and the newer ones are 59.25. You would have to use offset rims. The newer ones do have a better posi unit but they are a lot weaker than the early 8.2s. The housing is also smaller and you would have to design a spring perch