440 rear main seal... thoughts

If me, put the alignment pins in, prep the seals with a tad of silicon behind, roll in the block side if needed With light oil on the crank side. Make sure the lip on the half rounds is facing inward, put a light coat of silicon over the 4 side rings and lightly push it home. Pop out the pins and insert the bolts and torque to factory specs.
That sounds like a Proper Procedure!