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Re: 89 Silverado Z71
Ok is useing efi simple do I have to buy the software?
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94 Silverado 1500 ext. Cab short bed 350 nv4500 (factory) 
78 K20 350 (soon to be 400sbc if I can find one) sm465 205 dana44 14bff 6in lift on 37" militarys
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