You dont! Unless that dealer kept records of it; Consider all the Dana changeovers...All mostly were VN cars. How many Camaros,etc did they change? What Chevrolet dealer in all of the US didnt have part #s or ordering capabilities to any engine available from GM! Why couldnt I have walked in, slapped down a payment on a base X44 car at that time and pay that dealership(dealership willing) the extra money and fees to R&R any motor and install any L88 available at that time?