Kucharo had a very big break. I recall that when the PBT (circa 1996) had a poll in which only its playing members voted, Kucharo beat out Archer by one vote for having the best break.
I'd say several over the years had at least as big a break as Kucharo, including Wade Crane, David Howard, Mike Dechaine and Jeff DeLuna. My nominee for biggest break ever would be Jeff DeLuna.
On the radar gun, the world record back then was just 33 MPH, but in the current era, both DeLuna and Dechaine have hit 38 MPH.