You may have had a block with thin bores, but it has nothing to do with the casting year of the block. All year blocks of all displacements suffer from poor casting quality in terms of core shift. This is proven fact that makes all the "thickwall" stories just that. Stories. The correct approach is to have any block sonic tested, and if this is a bare block or shortblock it can be done easilly enough.
In terms of this exact build, this is a low rpm engine judging by the parts. Cast crank, and hyper pistons. I wouldn't use the Eagle cast crank for anything serious and I'd never use hypers for a 4" stroke.
