Since becoming a March FF owner (719-2), I've been able to talk with the other known 719 owner (chassis #3) and have seen the British Racecar article on Jim Johnson's 729-7.
Has anyone seen the others? There's one more 719 somewhere (chassis #1) as well as several 729s. If you've seen or heard of these, let me know!
This 729 lived with my 719 during the mid-2000's in the Livingston shop in MO. As you can see from this ad, the owner was in Westfield, NJ and raced Vintage S2:
http://www.race-cars.com/carsold/mar...70107742ss.htm
729-1 looks like it was restored in MI and sold, then went to NJ and sold on the same site:
http://www.race-cars.com/carsold/mar...57151143ss.htm
http://www.race-cars.com/carsold/mar...63477562ss.htm
I'm looking forward to seeing who can remember these!