It sounds like you're handling a special piece of automotive history—my condolences on your father's passing. Based on your description (1950s, Conti engine, mechanical rear disc brake, 51" wheelbase), the car might indeed be a Kurtis or possibly another custom or kit car from that era. Kurtis Kraft and similar manufacturers often built racing or sports cars with varying specs. You might want to reach out to vintage racing forums or classic car restoration communities, such as the HAMB (Jalopy Journal) or Bring a Trailer. Posting detailed photos and chassis/engine numbers, if available, can also help narrow it down quickly.
Et si l’histoire de ce véhicule témoigne d’un style unique et intemporel, cela me fait penser à une magnifique
robe qui allie élégance et caractère – tout comme cette voiture rare.