My preference is Chevron's Delo EP 00 semi-fluid grease. It matches the consistency of the NLA Chevy grease that was spec'ed in the mid-'50s, when Chevy stopped recommending gear oil based on customer complaints of leakage (according to Service Bulletin). It's a grade lighter than the commonly used J-D Corn Head grease (which is an NLGI 0 rated grease).
Interestingly, while the J-D and Chevron Delo products (as well as similar products from Shell and Mobil) meet EP wear specifications, the pricier Penrite fluid does not, by their own specs. Downside of the Chevron, Mobil, and Shell EP 00 greases is that the minimum packaging size is a 5 gal (35#) pail. I have a lifetime supply.... LOL.