I mentioned this, Steve. I suspect year one would have it. Since the big blocks are all similar, one for a 440 should be the same for a Roadrunner or Charger as for an Imperial.
I also read a members comment about putting fiberglass house insulation under the intake... I remember seeing all those foil packs of insulation under the intakes of cars I had when I was younger (haven't had to tear that deep into the Imperials yet!). Any idea where those foil packs can be had??