APPLICATION: THIS IS A V8 COMPRESSED NATURAL GAS CONVERSION KITTHIS KIT WILL WORK WITH VEHICLES WITH OR WITH-OUT A HEATERTHE KIT IS DESIGNED TO USE YOUR EXISTING THROTTLE PLATETHE 425 IS A DIRECT BOLT ON FOR THE HOLLEY 4 BARREL 600CFM(OTHER THROTTLE PLATES REQUIRE ADAPTER)INCLUDES:IMPCO ORIGINAL REGULATORS AND 425 MIXER, HOLLEY AIR CLEANER ALONG WITH EVERYTHING YOU NEED EXCEPT FOR HIGH PRESSURE LINE AND TANKKIT DOES NOT COME WITH HIGH PRESSURE LINE OR TANKWE CAN SUPPLY THESECOMPONENTS, JUST LET US KNOW WHAT YOU NEED!NOTE:GENERAL INSTRUCTIONS INCLUDEDMAY COME WITH DIFFERENT REGULATOR BRACKETWE ALSO SUPPLY ADAPTERS AND THROTTLE PLATESFEEL FREE TO EMAIL US WITH QUESTIONS!MOST ORDERS SHIP IN 2-10 BUSINESS DAYS, FREE SHIPPING IN THE 48 STATESBe sure to add me to your favorites list!Check out my other items!Sign up for PayPal; the fast, easy, and secure way to pay online. Feel free to ask us about conversion kits for almost anything including trucks, cars, generators, tractors, boats, motorcycles, RVs etc. We can build a kit to convert almost any engine!