A search under the Chevrolet Truck 3000/4000 Series 6 cylinder for 1955-59 listing shows the following Delco-Remy Part Numbers for your 1957 235 application (screenshot below):
~ Dan 1951 Chevy 3 window 3100 Follow this story in the DITY Gallery "My Grandpa Carl's Truck and How it Became Mine" 1966 Chevelle (Wife's Hot Rod) | 2013 Chevy Silverado (Current daily driver) US Army MSG Retired (1977-1998) | Com Fac Maint Lead Tech Retired (1998-2021)