Should the frame be boxed on an F1?

Putting a mild 351c in a '52 F1 - do I need to box the frame? The cleveland won't put out much more than 300hp and the truck will mostly just be used for cruising around in the summer - maybe the occasional stop light race, but nothing serious. Probably AOD trans with steeper rear gears.

 

In my humble opinion, I believe boxing is a good idea, it helps reduce chassis twisted which in turn makes the suspension do its job better.
Less chassis twist means at a minimum that there is less stress on your sheet metal hence cab etc should stay in better condition, ie no tears or cracks.
I am convinced a boxed chassis will enhance load carrying should you every haul loads.