3. Before commencing the flight training the applicant shall:
(b) have complied with the prerequisites for the issue of a class or type rating for multi-engine aeroplanes in accordance with Subpart H, if a multi-engine aeroplane is to be used on the skill test.
The prerequisites are:
(a) Single-pilot aeroplanes
Applicants for the issue of a first class or type rating on a single-pilot aeroplane seeking the privilege to operate the aeroplane in multi-pilot operations shall meet the requirements in points (b)(4) and (b)(5).
Additionally, for:
(1) Single-pilot multi-engine aeroplanes
Applicants for the issue of a first class or type rating on a single-pilot multi-engine aeroplane shall have completed at least 70 hours as PIC in aeroplanes.
Quite clear, you need 70 hours PIC before comencing the flight training