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Go here and select the Overview tab. It shows two links, generic and enhanced parameters. Selecting each one takes you to a list of those parameters.
Basically, generic parameters are those shared across all OBDII vehicles. Enhanced parameters are platform specific, so you would need the GM enhanced parameters for an fbody.
Personally, I would do one of two things: Find a used version of Autotap for a discounted price, or purchase a real tuning suite. For an LS1, I would take the second choice. Owning an LT1, which is ignored by the tuning world, I was forced to take option one.

