Hey Ken,
A couple of years ago, Accel had a system with seperate injectors, an adapter you could weld into any intake manifold to mount the injectors, a 90 degree adapter from a standard carb mount into a TPI throttle body. I'm sure they had computers and wiring harnesses as well.
If you're set on building your own (very cool idea, BTW) you might start with one of those kits and modify the 90 degree adapter (or just build your own) so that it was more of a plenum with more volume.
