Installing rear main bearing seal 273

I'm rebuilding my 1966 273 and have a question about the rear main bearing seal. The replacement I have is a Felpro rubber seal instead of the original rope type. I think I recall reading somewhere when installing a rubber replacement that is necessary to cut/clip at least some the outside fingers on the seal half that goes into the outer edge of the main bearing cap.

Instructions that came with the Felpro seal says to apply RTV to the outside edge in recess groove on the block. There is no recess groove in the block, but there are grooves in the cap itself.

Just want to be sure this rear main seal installation is done correctly now rather than discovering the mistake after the engine is reinstalled and running.

Thanks for any suggestions.