The Stovebolt Site Forums The Shop Area Engine Shop Spark plugs for a 235 engine 1954 Chevrolet

I found this: http://www.sparkplug-crossreference.com/convert/AC_DELCO/44
And some information from The Second Chance Garage:
1951 235 AC 46-5 Gap 0.035
1951 235 AC 46-5 Gap 0.035 with the Powerglide
1952 216 AC 46-5 Gap 0.035
1952 235 AC 46-5 Gap 0.035
1952 235 AC 46-5 Gap 0.035 with the Powerglide
1952 216 AC 46-5 Gap 0.035
1953 235 AC 44-5 Gap 0.035 without the Powerglide
1953 235 AC 44-5 Gap 0.035 with the Powerglide
1954 235 AC 44-5 Gap 0.035 without the Powerglide
1954 235 AC 44-5 Gap 0.035 with the Powerglide
1955 235 AC 44-5 Gap 0.035
1956 235 AC 44-5 Gap 0.035
1957 235 AC 44 Gap 0.035
1958 235 AC 44 Gap 0.035
1959 235 AC 44 Gap 0.035
1960 235 AC 44 Gap 0.035
Might be helpful