You'll see a number of pdfs for Angels 20 cards, organized by nation. The US file have a bunch of cards, including the Hellcat. Still checking out the UK file. You'll need a Boardgamegeek account, but that was easy to do.
Edit: Latest model Spitfire is the Mk IX, but still some interesting cards. There is a card included with each set that includes some special ammo and firing arc rules, but the planes themselves look like they'ed be fine for use with standard rules. Points may not be perfect, but they look reasonably close.
A lot of the old site cards were on photobucket and were lost when that provider increased their hosting costs. Some of the long-timers here have some of that old stuff saved on hard drives, so all hope for those things isn't lost.
I wish to have no connection with any ship that does not sail fast; for I intend to go in harm's way. - Captain John Paul Jones