Kenny, last Sept some of our Ind/Ky VCA folks checked into this specific situation...one gentleman told me that his company specifically agreed that he was covered for Viper Days safety course type instruction...BUT, he was NOT covered for the drag racing that preceeded VOI.7.
The KEY, in MY opinion, is to FULLY describe the particular driving event to your agent and home office, and obtain their opinion in writing prior to the event...just as you are attempting. I'm sorry that the guy is on vacation and I can't tell you the name of his company.
As an aside...with my renewal policy in hand and agent that was kind enough to make the 2 hr. drive to my house earlier this year, I was told that Wife and I WOULD BE covered for Viper Days Safety Course...company is Fireman's Fund. That policy, however, specifically EXCLUDES racing events/speed contests or preparation for same...including damage done within the property of a dedicated racing facility WHILE preparing for or participating in a racing/speed event.
One of my Porsche 996TT pals essentially got the same answer as we did from his Chubb rep. concerning his participation in the novice class of the Porsche Club's annual spring driver's school.
Hope this gives you some encouragement, as there ARE companies that do indeed seem to recognize the value of driving instruction with cars such as our Vipers.