Try Patrick's Antique Auto in Arizona (Google Search). They sometimes have used and or used-reconditioned 54/55 first series grills. Also a good source of period reproduction 6 cylinder performance and engine rebuild parts as well as some bolt in transmission adapter and shift likage kits and ring and pinion parts that make driving much more pleasant.
My '54 3100 is done up as a 60s style "resto mod" with modified 235, GM Saginaw 4-speed, Chevelle rear end, dropped axle, Corvette Rallye wheels, etc. I've enjoyed it for the past 13 years and baby boomers love the built six and the sound through Fenton headers and dual exhausts.
Good luck on finding a grill and drive it a lot.
Ira