Drip rails, go or stay?

[red caddy]

I started the body prep on my '86 GMC and have some "Q"'s.

Factory drip rails, Should I shave them or put 'em back? If I shave them, what's the best way to fill the screw holes? Welding will leave bare metal inside the roof, I can't see any way to seal in side. Dimpleing and filling with "all metal", then normal surface prep, looks like the way to go if I shave them. Any tricks I should know?

What, if any problems will I encounter if I leave them off? Our normal Tropical Monsoon rains, here in so. Florida, have me concerned about water intrusion. What do ya'all think? Thanks, Paul