Never heard of a "Rally Sport" option for Corvette....that was an option on Camaros, tho.
There were just a little less than 7000 '79 Corvettes built with the front and rear spoilers, but they were not part of any particular "package"...just an option. They do add a small amount to the value of the car if they were factory installed, but not a lot. The spoilers could also be bought from the dealer over the counter...
Tell us more about the car you are looking at....colors, engine/trans, etc.
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Joel Adams
C3VR Lifetime Member #56
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"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"