I have reviewed the longitudinal FWD layout before I suggest: current in-game longitudinal FWD is like a front mid-engine, FWD (MF) layout found in Citroen DS/SM, Saab Sonett I, Renault 4, 5, 6, and 16, that set the engine within the wheelbase, which made those cars had long hood.
So I have a suggestion: conventional longitudinal FWD layout, in addition to the current front mid-engine, FWD (MF) layout, while the MF layout will be renamed to Mid FWD in game to avoid confusion with the Longitudinal FWD, that the MF layout has south-north layout, while conventional FWD retained north-south layout like front-engine RWD layout (see also at the reference image).
Here are the list of conventional longitudinal FWD cars, if not all: Subaru 1000/FF-1/Leone or L-Series/Impreza/Legacy/XT Coupe or Vortex/SVX, Honda Legend (2nd and 3rd)/Vigor/Inspire/Saber/Ascot/Rafaga, Toyota Tercel (1st only), Audi A4/A5/A6/A7/A8, Volkswagen K70/Passat (B1, B2 and B5), Ford P4/P6/Corcel/Del Rey, Saab 99/900, Lancia Flavia/Fulvia/Gamma, Alfa Romeo Alfasud/Sprint/33, Citroen 2CV/Dyane/GS, Renault 12/15/17/18/20/21/25 and 30.
Further References I used to examine: http://discourse.automationgame.com/t/longitudinal-fwd-not-working-at-the-moment and https://forums.finalgear.com/general-automotive/longitudinally-mounted-fwd-cars-42470/
Conventional Longitudinal FWD layout reference (placed above the front axle).
compared to the current Longitudinal FWD in the game (technically a front-mid engine, FWD layout, also known as MF layout).