They should be the same. One of my Chevy Master Parts books says 1955 2nd series thru 1962 are the same for all 6 cylinders (235 & 261).

GM# 3774186

~ Dan
1951 Chevy 3 window 3100
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"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)