Not quite sure if the option codes changed year to year, but i have the Chevrolet Pickup Red Book. It is very helpful. These codes i found were for a '70:
J70 - brake booster, hydraulic
DG4 - west coast mirror, jr. stainless steel
G13 - unknown
YG7 - unknown
PA1 - unknown
G60 - auxiliary rear springs
F60 - heavy duty front springs
F51 - front and rear heavy duty shock absorbers
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"All Corvettes are red. The rest are mistakes." - John Heinricy
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