Don't know if there is a cut off. I know the H.A.M.B. has a cut off (1968?) It sez Late V8 (1954+). I've seen straight six ?'s and no one complained. My 1¢, ask and if someone has heartburn over it then we'll know the answer... and/or someone can point you in the right direction to find your answer.
Long as it's a Ford I don't think there's a year limit on the 'barn, so long as it's within one of the subgroups (Ts, As, early 8s, & late 8s). Ask away.
I don't think it'll get much interest here even though it is 54 & up. I know I would wouldn't look for something that new here.
I have an '01 Crown Vic and I direct my attention to a Crown Vic forum because I know I can find better answers there.
Best advice, try a forum more related to your car.