The Engine on my 69 Fury III Convertible is Red. However, 69FuryIIIConvertible has done a nice job on the engine paint and Turquoise was available in 1969. Seems to me that I read somewhere that 318's built in Canada were painted in Turquoise, but I could be wrong on that. My 69 will be undergoing a body off restoration. I will be modifying the 318 and upgrading the internals of the transmission and rear end, but the engine will remain red.
This is what I found searching the Web on Mopar Engine Colors for 1969.
1969 225 Six All Red Mopar Paint P4349218 1969 273 V8 - LA All Red Mopar Paint P4349218 1969 318 V8 - LA All Red Mopar Paint P4349218 1969 318 V8 - LA - Police only Police engine H-Orange Mopar Paint P4349216 1969 340 V8 - LA - See Note below All Red Mopar Paint P4349218 1969 383 V8 All Turquoise Mopar Paint P4120752 1969 383 V8 High Perf/Police High Perf H-Orange Mopar Paint P4349216 1969 426 HEMI Street Engine H-Orange Mopar Paint P4349216 1969 440 V8 All Turquoise Mopar Paint P4120752 1969 440 V8 High Perf/Police High Perf H-Orange Mopar Paint P4349216
I believe all of your work has produced the correct results for a U.S. built engine. The Windsor Engine Plant was it's own animal and did things their own way. I think you're both correct.