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I just went through this on Saturday. It is easy if the valvetrain is assembled in the engine. I took off my valve cover and measured the travel of one of the valves by turning the engine over by hand. Turned out to be .423" which according to the specs could be a D, K (both with .420" lift), or a Isky vv61 (with .425" lift). Since I have a FI engine I can pretty safely assume that it must be a stock D cam. After I went through that exercise I realized that I had been setting my valves too loose. They are now at the stock .016 clearence.
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