You might want to lightly sand the snout (fine paper/crocus cloth using brake fluid as a lubricant) until fairly smooth.
When installing the cover, leave loose and install balancer so as to center the snout within the seal. Then position cover to center seal over snout and torque to specs. Use white grease or engine oil to lubricate seal /snout contact surface.
There was a SPECIAL SERVICE TOOL for this years ago ...
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- WHY IS IT ... -
... that everything you buy in the grocery store is either wrapped in or contained in plastic but the government doesn't want you to carry it out in a plastic bag?
WONDERING IN W(BY GOD)V ...
DIAGNOSED CDO - (OCD In Correct Alphabetical Order)