Dave,
The SCTA rule book is great,,, LTA and ECTA rules "just about" if not fully "mirror" each other... If the LTA rules books are not out yet,,, you can order a ECTA rule book for $10.
Below 135 MPH the 944 should be fine... up to 150 maybe depending on seat, seat belts, and driver safety gear... Over 150 you will need roll bar/cage and all the good stuff..
the RULE book is your best friend.
Good luck and hope to meet you in Loring and or Maxton.
Charles