I don't know the exact designations, my books are at home.
The A-36 is the attack version of the P51, was used a lot in the Med.
I don't believe the P-38 was armed when it was in photo recon version, since the camera was loaded into the nose.
I have a magazine of a rebuilt P-51B that was modified to hold a camera. Or maybe it was an A model, I forget. Anyway, it still had 4x.50s in the wings but had the radio removed (I believe) because the camera sat right behind the pilot in the armored area behind the armored head rest.
Not sure about the Spit, but I think they were armed too.
I'm still at work, but in about 10 hours when I get home I can give you some better info.
-SW