Blakbuzzrd,
Personally, I really like using automotive acrylics on car models - if you paint carefully and don't put too much on at once, you shouldn't have any problems with the paint warping your car body - I never have.
I like it because the paint dries very hard, very quickly and can be cut and polished to a mirror finish just like a full size car.
As far as Ferarri paint colors - don't just go for a "Ferarri Red" !! There were very specific paint color formulas for many of their cars. I recently did a 1/9 Poscher F-40 for a client and had my local auto paint store look up the exact formula for the F-40 color and they mixed half a litre for me. In looking for the F-40 color, they found 10 or 15 different "Ferarri Reds" that have been used on different cars over the years - the Testarossas, 288GTO, 308s, Mondials - not every one was the same color red. Some were darker, some were lighter.
Another good source of info is the Secretary of a local Ferarri owners club. They are a wealth of information, and can often arrange a viewing of the full sized item for comparison. I've done this on many occasions and have ended up selling every Ferarri model I've made to these guys (passionate and fanatical).
Or then again, if you think all this seems like a bad case of obsessive compulsive disorder (I think I'm a terminal case) then just use the Testors paint.
Whatever you do, use a white primer. Test it out - take a bit of card stock or a tin can, paint half of one side with white and the other half with normal gray primer, then paint the red over both. It'll take twice as much paint to get the same bright color over the gray than the white.
Good Luck!!
Cheers'
LeeTree