I am using Aluminum Heads and an Aluminum Intake. I have had trouble getting the intake to seal. I have verified that the angle is correct by laying the intake on the engine and using feeler gauges all around the outside ports and under as well. I have been using the Fel Pro bathtub sheetmetal gasket. with a smear of sealer around the ports. I have heard Chrysler used a paper gasket set in addition to the sheetmetal one when aluminum intakes were used. Is this true and are they available? Thanks.