I have no idea on the rat problem, get that fixed for sure though!!
I'm not so sure about the oil thing, but I would keep an eye on it. I have had little oil bubbles appear on the dipstick on my truck, I have never had any problems, though its not nearly the same engine but its a thought that came to mind.
As for the exhaust, I would assume its normal for any exhaust system to turn black on the inside, I have seen plenty of systems including my own that turned black on the inside. It is possible that you are running a little rich, but I would think you would notice it forming small puffs behind your car when your gettin it, and you might see black soot forming on your bumper.
Hope this helped.
By the way, how did the engine painting go?
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Whats in the garage, well.... in the yard.
1986.5 Toyota Supra - NA - 5 spd
1986 Ford Ranger Lowrider - 5 spd
1984 Ford Ranger XLT - 7" Lift - 4X4 - Auto
"Stuck in the 80's"
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