You may log the time you were controlling the aircraft as pilot time. You
may log it as PIC time if the P-51 does not require a type rating.
§ 61.51 Pilot logbooks.
(c) Logging of pilot time. The pilot time described in this section may be
used to:

(1) Apply for a certificate or rating issued under this part; or

(2) Satisfy the recent flight experience requirements of this part.

(e) Logging pilot-in-command flight time. (1) A recreational, private, or
commercial pilot may log pilot-in- command time only for that flight time
during which that person-

(i) Is the sole manipulator of the controls of an aircraft for which the
pilot is rated;