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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"Last Sunday, I caught him makin' eyes at Idell Bushey durin' preachin'. And I know what they do up there in the hills when they say they're possum huntin'. They're just sittin' around the campfire, drinkin' hard cider, hittin' each other on the shoulder and hollerin' 'flinch!'."
― Charlene Darling (Daughter of Briscoe Darling)