Thanks for posting this. I see the original engine spec'd was an 85hp, probably a Beta. I doubt any were delivered with the Beta since the 120hp Deere 4045T was only a $1900 upgrade. Wonder if there are specs for the prop matched to the 85hp? Or if Willard even made a change when going to the upgraded engine? Zimmerman Marine in Virginia was the east coast dealer at the time - might be able to ping them (I forget the name of the the owner - he's a frequent contributor to Passagemaker Magazine so should be fairly easy to find).
In the 2000 timeframe, I was actively delivering boats, and a standard presenter at all TrawlerFests. The Nordhavn 40, a direct competitor to the Willard 40, carried a list price of about the same as the W40's $420k. N40 production moved from the Pacific Seacraft yard in southern California to China where the first 10-hulls carried a base-price of $399k. It was impossible for Willard to compete with the N40 given the N40 had recently completed their round-the-world stunt, plus the Willard's fit/finish and layout were not perceived as positively as the Nordhavn.
There are two things Willard could have done that may have altered their trajectory:
1970 Willard 36 Sedan Hull #40