If it would hook, which i don't think it will. It could run 5 teens. By hooking i'm saying under 1.20 60' times. But with 28X10 tires i think it will run 1.25 plus 60' times and that will put it with good conditions at about 5.60.
The problem with roots type blowers is the HP is instant, where turbo's come on slow.
So i'm gonna say with a 200lb driver, car at 2750lb total, i'd be surprised if it runs better than 5.60 It could run a lot better if it hooks, maybe even closer to your prediction.
JMO
Zip.