You just need EOS, Coil Stop and possibly the right size coil. Do not replace the link as the new links are different material and don't have the correct compliance of an old link. They bounce too much even with the spring tightened. Trust me I learned the hard way.

Do everything you can to keep original parts as you are doing. Nice job.

I always keep original springs and links. Just clean them up because the plastic did not wear. I will grind off any buring on the plunger that hits the stop but that is it. A WPC style link is a pretty serious modification which I would think would take away from the Classic Stern feel. Ronnie as far as problems with your power its probably the coil, EOS switch and make sure you redo your connectors. All of the parts that are in the flipper circuit. Make sure you re-tap the coil stop screw holes and put in 8/32 or add a small nut on the back if you tap through. The screw must me a hardened screw or they will break off. Make sure the coil stop is straight and in place. Also check the bushing and make sure its OK. Typically they are fine. Never had to replace the flipper links or paws in any of my classic sterns except 1 time on a Seawitch.

You can take apart and sand the top white ring part that is exposed to the playfield and make minty fresh. Also paint with plastic paint to make perfect. yes they are perfect. God's creation of the ideal pop bumper.