The correct size for your 235 is the 0.990 diameter ones. The 0.842 fit Chevy small blocks/big blocks and later GM (1963 and up) 6 cylinder applications. They do not fit the earlier 216/235/261 engines (their application listing is wrong).

Went down that rabbit hole when trying to source new lifters for my 261 recently. dang

~ 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)