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Hey Ty,

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Your description of the rear is quite interesting! It is not uncommon for a particular ratio to be hand written on the order form, yet the car comes from GM with something different. In my experience, when there is something handwritten on the order form, it doesn't hold much creedence - ie; the car came with whatever gear GM felt like installing, and not necessarily the standard ratio for the engine code. So, if 4.88's were requested, it sounds like GM installed a 3.31. This is a little unusual because the standard ratio for an L78 would be a 3.55, the 3.31 was standard for the L34 Novas. This was not set in stone however, so there are L78 Novas with anything from 4.10 posi's to 2.73 open's. I've never witnessed a ratio lower (numerically higher) than a 4.10 in a Nova through '69, and a 3.55 for '70+ - unless it was a copo Nova. IMHO, it sounds like the 4.88's were dealer installed, which actually makes it quite unique.

Most years of Novas contain a broadcast sheet under the seats, but for '68-'69 that broadcast sheet will contain the engine code! So, be sure to pull the seats and look for it.