Good question. Mine has the stripe & all it has on the fender is the fish emblem. Pictures of my dads 69 cuda (in 69) doesn't have the stripe & it has the 340-s on the fenders. OOOPs I am wrong all mine has is the BAARACUDA emblems
I think Ma Mopar did this in various ways from what I can see. Seems though that if the stripe was present with the engine callout you wouldn't have the script callout on the fender. Maybe a fish in that spot.