make sure you TOTALLY fill any holes left as ,this was my motors achillees heel!
the passenger side was lets say "air-cooled",seal it ,rust proof it,prime ,u/c,and finnish paint it,then paint it twice more!

check the water run! off the screen-down the wing gulley, to the rubber bonnet softener,-down the strut housing-onto the battery tray,-under the tray,over the bulkhead!,damm nasty!

heres a simple mod! remove the bonnet rubber on the inner wings! cut out a small section (like a "V" shape),so some water can pass along the inner wing sill,(the rubber fits tight into the wing gully-you will now have a triangle gap for water to pass through) this water will now pass behind your headlights now so make sure they are well waxed,

hope this helps!