Are you going to use a factory radio/speaker? If you are, and your truck is a 1954 Chevrolet, I think that there are no aftermarket electric wipers that will mount with the original radio/speaker in place (if you have a GMC, it is no problem).

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.