lets start with, how is it pronounced? "hood-isle" "who-delay" "who-dial" ??? Is one year more desirable than another? Is the dampening linear in the arc, or is it progressive toward the ends of the arc?
Who die. Yes, one year is more desirable than another. Choose the year that fits your car best. I'm no expert, but I think the dampening is the same all through the arc. Here's a bunch of technical info (note the website is spelled wrong): http://www.oldcarmanualproject.com/manuals/Ford/Haudaille/index.html
The most recent Rodder's Journal has a pretty good article on history and current aftermarket offerings.
Used on many cars besides Fords. My Avatar used Studebaker Champion rears on the front. They had an easily modifiable flat bar stock lever arm.
The Jalopy Journal
