Ted,

Check out any brand of black-wall light truck tire. Go for the highest profile you can use on a 7" rim (if you want it to somewhat resemble an original tire).

Tim

Here are a few calculators that might be helpful:

http://www.dakota-truck.net/CGI-BIN/TireCalc.cgi

http://www.gordon-glasgow.org/tirecalc.html?rim=7


Tim
1954Advance-Design.com
1954 3106 Carryall Suburban
1954 3104 5-window pickup w/Hydra-Matic
The 216 and early 235 engines are not "splash oilers" -- this is a splash oiler.