Bridges are easy if all the parts are there. Replacement intonation screws and saddle height screws are readily available. Re-tapping holes is quite simple, if you can't do it, ask a neighbor; you know the guy who is always fixing things.... every street has one!. The finish is IRRELEVANT. Clean it up and leave it. Brush off rust, rub in a little oil, wipe it very clean.
Tuners, you said maybe. That says to me they are likely OK as is. Clean and lube them up and put them back on. generally old tuners are a breeze to dismantle and clean up.
Oh how I wish I had never changed the original crappy bridge on my 75 G-3 when I was a kid in 1980! I lost it and regret it now I'll tell you!
PICS PLEASE!