Its not Guradsman blue.
The PPG Guardsman blue formula is:
Global guardsman;
D742 - 839 - 4
D771 - 1571 - 8
D754 - 1864 - 2
D740 - 1880 - 8
D753 - 1890 - 4
Just get your paint shop to mix some up. Spray it on a panel.
I can guarantee that it will look exactly the colour of the 427 car that Miles etc. used/raced.
The other colour appears to be the Royal blue. However, if you are considering that colour I would suggest that you check the colour on a car in the flesh (so to speak).
Here, I would chase up a Superformance owner/s. SPF use both the Guardsman colour and the Royal blue.
The SPF web site does have some details but again its hard to make a decision unless you see the car.
Good luck with your choice. My car is still in Gel coat and it goes in in April for colour. Will Post new photos then.
Bernie
Cruising in the summer sun