I've used Chevron Delo 400 15W-40 in my Studebakers for well over 30 years with excellent results. Being that you are in Delaware an HDEO 10W-30 would also be a good choice for a Hudson engine.
I agree with the HDEO requirement. Amsoil ZRod is a good choice too, but may be problematic depending upon how original stuff is in there, and if the originality of the engine and whatnot matters...
Does the '52 have the cork clutch? I would be seeking the local Hudson club. Out on 140 in Franklin is a push me pulleee you. 2 Hudsons cut off at the B pillar and joined together