i will argue confidently that ALL 1968 340 mopar engines were painted RED from the factory and that RED is the only "correct" color for a 68 340. beginning in 1969 is when "OEM engine paint" seems to have been "whatever was on the shelf" at the manufacturing plant. the majority of restoration sources i've seen say "hemi orange" is the "correct" color for a 69 340. HOWEVER - there were turquoise (Chrysler Blue) 340's in 69 and a few "carry-over" 1968 Red 1969 340's. i "believe" all 318 motors were painted Chrysler Blue in 1969 and i suspect some of the small block engine assembly lines just painted 340's with the same paint as the 318's.