He probably is reffering to how the MG TD had a slight angle to the grill, making the grill a slight outward pointing arrow shape.
It is inspired by a TD, which had a more rectangular grille It has just look better. Also, as stated before, it won't be a 1:1 TD --- Post updated --- This was at 45mph, most of the jbeam is still work in progress.
I think this will work with the British Numberplate mod with the "Classic Numberplate" option quite well to be honest. That would be good advice to anyone here who would want to do a realistic roleplay with the car.
Tweaking the Burnside's sound could work, maybe mix it with another engine, idk. It's coming along very nicely though!