You can get a complete wiper setup with electric wipers, both with delay and without, through Chevs of the 40's. http://www.chevsofthe40s.com/ They've got a ton of stuff for these cars. I am working on a '47 Chevy Coupe myself, and have ordered many parts from them. Just wanted to pass that along if you hadn't already found one yet. Good luck with it!

Doesn’t eastwood co. make a replacement electric wiper motor/ass. for early coupes? I seem to recall a buddy putting these in a 40 Ford because the old vacuum style ones were just a wee bit slow when you constantly put your foot into it....