Gary, those are magnificent bikes. I've always wanted a street legal XR750 and a big dirt framed street single. (Should flip the shocks on the 2nd bike, if they'll clear... unsprung weight.)
(The Buell fits the bill for me today (power, delivery, weight) in a more refined package (saddle, brakes, suspension, etc) off the shelf. The big KTM single would scratch my thumper itch. But..., neither look at all right and make too much sense in comparison to the old man-made bikes. I don't have time to build bikes, anymore...)
-Charlie