Take a look at CAM decals also. I know there are not many 32nd scale decal lines left, but with Trumpeter's kits on the market, I am pretty sure there are some sheets out there. If you want to try to remove the yellowing, put the kit decal sheet in a zip lock bag, seal it, then tape it to a window pane that gets LOTS of direct sunlight. Within a week or so, you will have the yellowing bleached out by the sunlight.
also you may want to check this website to see what is out there for 32nd scale F4Us.
http://www.largescaleplanes.com/
F is for FIRE, That burns down the whole town!
U is for URANIUM... BOMBS!
N is for NO SURVIVORS...
- Plankton
LSM