Early engine bay decal placement
I don't think the do-not-wash-or-oil decal should be front and center. At least it was not on mine. Here's a pic of my Commando 273 back in 69. That decal was gone by then, but you can see where it was on the air cleaner.
The top antifreeze decal (above) goes on the radiator support. Doubt there is a specific measured location for it. The other two decals, I don't remember where they went or even if my Barracuda had them.