Don & Steve - Yes, I agree for a light car it is respectable but, take this into consideration, I have a LS 7 in my Corvette, it has a Callaway air box and Corsa cat back exhaust, and a tuned computer. It made 486 rear wheel HP. The roadster has a Comp cam blueprinted tolerance's and long tube headers. The variable is the different dyno's. The corvette was run on a Dyna Jet and the roadster on a Mustang, which is known to be more conservative than a Dyna Jet.
I'm going to take it back again and take out the air filter. It there is a noticeable difference than I will make a new air inlet tube to the throttle body. In my opinion it should make at least 550hp I'm a hundred off somewhere and I think it is starving for air.
Don, I worked on his '63 1/2 fastback. His son and Ford are coming out with a new project in remembrance of his father.
Ken