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Oil normally darkens because of the crap it cleans off the cylinder walls while the engine is running. Exhaust is normally black from excess fuel and not to mention it is fire. These engines have a wider tolerance then new engines so expect it to burn more oil and to darken the oil a little more quickly than the newer engines of today.
For example. On my car I can change the oil and after 500 miles of city/highway driving, it will be a bit darker. My car is a 2003.
On my older 91, the oil will be much darker than the 2003 even though it is the same miles.
Likewise, the same car on the interstate at a given speed for 1000 miles may still look brand new. It really depends on the driving style and how well your engine is tuned.
To put it short and sweet, it's fine man. Just change it every 3k like normal.
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