No idea about racing history, although the chassis number is P3041 of this yellow Interim, not 3104 (there is a mention on Morgan Experience of 3104 having some race heritage)..The Yellow +4 advertised on BaT was listed as P3041. It would be interesting to know if there has been a transposition on numbers somewhere?
This is one of the pictures on the Bringatrailer listing, if it helps...
bringatrailer.com/wp-content/uploads/2022/04/1954_morgan_plus-4_img_6919-1-1-06118.jpg