rear swap '51 chevy pickup

[TimS37]

I want replace the original sealed driveshaft/rear with an open shaft/rear application. I'm putting a 350 engine / 350TH trans. in the truck, but I don't know what rear to put into it. If anyone could give me some insight on what rearend works best without heavy modifications to it, I would appreciate it greatly. The original rear width is about 51" from back plate to back plate. I'm looking for something with a 5-lug pattern and disc or drum brakes.