[Excaliber]

I would also pull a valve cover to see if the rocker arms are adjustable, if so, most likely solid lifters. But if they are hydraulic lifters AND the block is a 427 side oiler, then it HAS to be a late 67-68 year model.

In my opinion the most valubale 427 side oiler block would the late model drilled for hydro lifters. You then have a choice on which kind of camshaft you might want to run. Roller hydraulic, flat tappet hydraulic, or solid\roller lifters. With the older block you can ONLY run solid lifters.