Hi Bob
You asked about slow moving wipers with a 216 engine, I knew I had some video that showed driving in the rain. So I've added some drivers eye view of my HUP and C60S on the road. Look at the bottom of the page here is the link
http://www.canadianmilitarypattern.com/CMP%20Videos.htm
There are a Hi Resolution and Medium Resolution of each video.
You can also see that the wipers didn't really make much difference with the Rainx on the glass
Cheers Phil