Thanks for making my point. If a Cobra were to be road course competitive in today's world you'd have to make it into something it ain't.
Solo II can be tricky if your perspective is based on tunnel vision and there is always a local hotshoe around that can beat you pushing a wheelbarrow. What you should do is compare your course times overall, and see who beats you. You'll probably find a lot of lesser rides going much faster. If it were not so there would be a plethera of Cobras in Pro Solo and to my knowledge there hasn't been one appear in years. Solo II has truly become a game unto itself.
I'm not entirely sure what you mean by "open event" unless you mean tuner days at the local course, where you run what you brung. If so, comparisons are much harder to qualify than in a 20 minute event where tenths of a second/lap computes to being lapped.
There are some who say one of the toughest tests for man and machine are the 7/7 events (7 tracks in 7 days) and even then you have to be careful who you root for. Last year's event on the left coast saw a turbocharged Miata (350 hp and 375 ft. lbs of torque) (
www.flyinmiata.com ) ran a close second overall to a well turned out Viper. I don't recall any Cobras in the mix.
Most of this is determined what exactly is meant by "fast". The Cobra is pleanty fast, but from a purely competetive standpoint can be beat by many with current tech. I'm not sure what Region you belong to but here there are any number of RX7's that will show you where the bear went through the buckwheat at a track event.