I have a 95 Impala, what do I need as far as parts to convert to LS2 Coils ? I see the coils on ebay, but some say for a Suburban, Tahoe, Silverado,etc. Which ones do I get ? Also which plug wires, does anything get hooked up to the Opti, or do I eliminate the Opti? Please shed some light and provide detail on everything needed to make this work . Thank you very much .