To box or not to box, that is the question.

[nateshrek]

Hey fellas,
Just wondering your thoughts on boxing a frame? I'm runnin a 1965 gmc 1500,totally stock in regards to the frame. I'm the one planning on putting a cummins in it. I've done a lot of reading on this and some say to box and some say not to. It causes more stress crack. Or some say just weld a strap along the top of the frame rail. Some say it all depends on what you're doing with it. So here's my plans for the truck.
Purely a pavement crusher. Maybe drive back a field to a field party but not muddin. No drag racing except between stoplights.
I'm sure there's other posts about this, but I'd like a fresh start on it and everyone knowing the specific application, for best advice.

Thanks guys!