I have a 727 from a 90 vette and one from a 88 grandprix(what a price difference!!!!) Memcals look the same. Can I just reprogram the chip or do I have to change memcals(esc chip is in the memcal ect though it looks the same too) Dont want to pay 50 bucks for a new memcal if I dont have to. Thanks, >Max