That looks really nice Matt, its a good pulling engine the dohc and will suit the roadster really well. Been out in a couple of Sierra with the same engine and they pull very well. It's just the size and weight of the engine that puts some people off.
For me i would keep the intake as short as poss with a nice cone filter on for that nice induction roar, i've always believed that for production cars the long runners and air boxes is to prevent any induction roar - not really what we want....
Well Done....AndyH