If its a super sonic and has the 440/454 rotary valve motor in it someone put it in. The supersonic was a 340/354 the ultra sonic was the 440/454. Its probably a ultrasonic with a supersonic hood,not that it matters it's still a cool old sled. Just FYI.
I could not agree more Dean ia a awesome guy to deal with and very knowledgeable with all things boosted.He has helped me out with my s chassis light mod with a 159 and it turned out great.