It'll be hard to match the color, because it has faded from heat, and age. P4349217 "blue" looks like your pictures when it ages. If you plan on repainting everything, I believe it is the "correct" color. If your engine is supposed to be P4120752 "turquoise" that would be very rare for a small block. But anything is possible I guess.
The color that you suggested is not available per Summit. The one I ordered looks close in the picture, but who knows what it looks like until you spray it. I'm hoping it matches. If not, maybe the one you suggested will be available by then.
I just want whatever I get to be a close match to my engine, even if it's not completely correct.