For the post-War lighter blue, try Plasticote Hi-temp (to 500 degrees) Engine paint GM Corporate Blue No. 221.
I'll be darned if I can tell the difference between it and this "Chris Craft Marine" blue the restoration supply people sell for $9 or $10 a can. The cap color looks darker, but when you actually spray it on, only a "young researcher" could tell the difference.
I got some at a local "Tractor Supply" store.