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Just did a quick search on the internet "289 2 barrel intake manifolds(2): C8AE-9425-B". Its the 289, which is in the 221/260/289/302/351w V8 family. Hope this helps.
1968 was a transition year for the SBF. Without knowing the block numbers, chances are you have a 289. No big deal; a 28.8oz balance crank and rods make it a 302. Everything else is the same.