Back in the 70's and 80's the Tiger club Pilots had all the main F1 racers.
Several Cassutts, and a couple of Cosmic Wind's.
Speak to :-
Brian Smith ( he flies with the Fighter Collection ) had a Cassutt.
Steve Thompson - used to have a very fast Cassutt and took it to Reno.
Robin Voice -- used to have both a Cassutt and Cosmic. He wrote an article recently about fuel caps in one of the Mags.
Or try Pete Kynsey at Fighter Collection, for some of their contacts.
I do remember the Cassutts getting slimmer each season and faster.