RE: Le Mans April '64 tests, in the Cobra Ferrari Wars book, it says that both Schlesser & Phil Hill drove CSX 2287, and both turned "moderate" laps, no times are given.
In the Time and Two Seats book, it says that at the April test, Schlesser turned a 4:02.3 as stated by 6R07mi above. there is no mention of Phil Hill driving.
Also not an attempt to state a historical fact, but what I found in those two books.
Mike