Denny, answers to your questions:
(1) The major improvement from the 1948 to 1949 W-1 is the additional of a linkage rod that connects the choke and throttle. The effect being that when the choke is engaged, the throttle is slightly opened (call it an inexpensive "fast idle" circuit).
(2)
1949 - 684s (this is the one with the expensive parts)
1948~1946 - 574s
1941~1942 - 483s
(3) You know the answer to this one.
As far as your comments concerning the legal aspects, I tend to agree with your thoughts, but so did the college kits that downloaded all of the songs, and received MAJOR bills from the music industry. As to my own website, I either wrote all of the information, or have written authority to share information I did not write. You, or anyone else, are welcome to use, or copy any information from our website (however, I would appreciate a comment as to the origin if you copy it for others). I started work on the application database in 1967.
Jon.
