If you follow the fairly known engine casting date code info, the following should indicate your engine info:

CON4 = Conveyor line # 4

A = January

8 = 8th Day of January

0 = 1960 (Model Year)

This should confirm you have a base level 1960 235 out of Chevy C-10 thru 30 combined with the other info you have provided.

~ Dan
1951 Chevy 3 window 3100
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