What is the absolutely correct blue engine paint color for a 74 Duster?

I just sprayed a /6 and a set of "302" heads for a 318 with that DE1631 and it wasn't anything like that. Well it was blue but not that shade. It came out a little darker than "Chevy blue".
That said, of the 2 small blocks pictured above the 1st one is closer to the original unrebuilt 318 in my 78 fury. And to find an original unrebuilt engine of the day would be a better reference. Not that my fury is rare or desirable or anything...
I went to a swap meet earlier this year and saw lots of blocks heads intakes etc there for sale (all Mopar related) that were the same color as the engine I painted shortly after that swap, and mentioned above, and obviously freshly painted for good "presentation" being for sale and all, and I remember thinking that the sellers were more interested in covering rust and dirt than making their parts look "right". Then I painted my stuff and realized then that these parts sellers probably used the same paint on their parts as I did..... And according to the can it was "Mopar blue" but even though that car is 30 miles away at my mom's garage/ and I haven't seen it since last fall, I know already that these 302 heads aren't gonna come anywhere close to matching that original block if I go to put them on that block.