Rumble,
Don't take this the wrong way, only trying to help. I have that same exact intake, same part number (P4452893), but the bolt holes on mine are in the correct location for a standard head. The intake was on my 1991 Super Commando Crate Motor (360 with 308 heads). My belief is that this was an early M1 intake and they must have drilled the bolt holes for different types of heads. My Super Commando (380hp version) used the LA block had other unique items. For example, the pistons were early KB Silvolites (PN#509) I called KB (talk to an engineer, not a sales guy) and he said they had no record of that part number. When I told him what they were in his comment was that Crysler often put one off parts in the early crate motors, like the pistons.