Absolutely, ya need new motor mounts! My '50, 3604 is all stock and only has a about the same space, never have figuerd out why. Might be the cab and core support rubber wheich needs to be replaced or the fan blades are pitched to much.
Whatever, the first thing that I did before I ever even drove the truck was instll new motor mounts, front and rear. The engine is rock solid now ya just see a twitch once in a while.
Denny Graham
Sandwich, IL