it looks like you could mill off some of the bottom of that Spectra Dual Plenum Snorkel thingy
& use a smaller retention devise, than that big a$$ nob
& possibly get most if not all of it, under the hood surface
I'd also suggest,
to put some aluminum inner fender panels, won't be much weight at all,
you could just use a couple tabs &/or Dzus fasteners, to hold them in,
to help to keep the open front end, from acting like a big wind damn/parachute also,
you very well may also pick up some et/mph there too...
Possibly, another suggestion, from the friendly peanut gallery...LOL
You could close off the area around the radiator too, top bottom sides, tapered into
direct the air thru the rad., not under hood or around the suspension/wheels/engine,
anything like what I suggested in both these critical areas,
would help allot with the aerodynamics, it's already like a big brick...
Anything will be better than a completely open front end,
I'm not trying to be overly critical or cynical, pick it apart, I'm just trying to help,
your so close to the 10's now, only a few minor improvements like that,
details would/could do it maybe !!
good luck have fun
So far this is what I have built. Looking for some kind of dome so I can cut out the rest of the hood to get it to close. 
