With lots of imaginative engineering and some machining - you could install some of the injectors in the interior of the plenum (the front and rear pair of runners are not covered completly by the top plate), plumb the injectors and route the electrical through the rear of the lower casting (there are a few flat areas where buckhead hardware could be mounted) and then use two 'dummied' Holley carbs as the throttle plates (with the TPS hooked to the linkage or installed on the drivers side carb out of sight.) ...
But - hey, I'm a dreamer sometimes anyway
I've seen a few set-ups using small GM TBI units grafted to various manifolds and using various ECU's and sensor combo's - some looked quite nice and I was told worked very well.
I would try to stick to 'factory' type systems and sensors if you go this route as parts availablity and cost will be more reasonable in the long run.
Of course you could also mount a couple Holley 670 2bl TBI units on top ( no one will know once the air cleaner is installed), along with the proper sensors from their kit(s) and go from there.
I'd just buy two(2) complete kits if you go this route so you have some 'spares' to modify and use as you delevope the set-up.
Of course GM beat us all to a system like this in 1982 with the 'Cease-Fire'
- oh, I'm sorry, it was really called the "Cross-Fire"
system, used on early Corvettes and later Camaros.
These are actually decent systems for some uses and work quite well if you know how to tune and repair them. I had one on a boat for @5 years and it gave me no problems I couldn't handle.
It did have a habit of just not starting at times ...
You might want to check out - http://www.affordable-fuel-injection...Fuel+Injection
Hopefully others will chime in with more info for you.