there are only two cars that were originally built as 412 p's: 0850 and 0854. p3 chassis. p3 typo motors except for carburetors in place of fi. p4 suspension 0844 and 0848 were originally p3 factory racecars but when ferrari sold them to customers they removed the lucas mechanical fuel injection and replaced it with weber carburetors which reduced their output, something ferrari wanted to do so that they would win points but not beat the factory cars which were then p4 0846 (see above), p4 0856, p4 0858, and p4 0860.