Bore size is simply not as critical as a head flow limitation on a Hemi, mainly because the valve motions angle toward the bore centers as they open, alleiviating much of the shouding that becomes an issue with a Wedge configuraion. On a wedge the valve action is straight and parallel to eachother, which means the edge of the valve stays at a fixed distance from the bore, with a hemi, the more you lift the valve the further away it moves away from the bore and closer to the center of the hole.

Sounds like a great combo to me