http://www.55-57chevys.com/coccc/art...9/68asty1.html

shows some detail on a 68 big chev.

Let's see.... I had a 68 with a 307, a 68 with a 327, a 68 with a 396, a 68 chevelle with a 307 and a 68 camaro with a 210 hp 327. All were lacking in go except the 396.