What can I expect for HP out of this 408. Anyone else have something similar?

I have a 750dp on my car in my sig (it is a 650dp with a 750 proform main body), and almost that same cam except mine is a roller (XR286R), and I use ported Eddy heads. It went 123 mph in the 1/4 last year....with that said, I am going to try a 950dp this year because I think it could use more carb.

I would think you should have a mid 11 second car. If I were to change anything it would be the intake (Air-gap), then the carb.