 The small tyre sizes and low car weights caused complaints amongst the old hands and owners, so for future races cars were restricted to minimum tyre sizes and minimum car weight.Soon after the Indy 500 race in 1963 Crosthwaite was approached by and moved to work at Holman Moody, the official race contractor for Ford.Ford wanted Holman Moody to submit a proposal to run an Indianapolis 500 car for 1964.