Not sure if anyone posted this guys (Leo Santucci's) 292 setup.
http://www.cdpautomachine.com/leo/leo.html
While it is in a Stude, it is still a pretty awesome engine.
The work he did on the head alone is pretty impressive and definitely not an off-the-shelf-deal.
I have been a fan of 292's ever since I had to change the lifters in my pop's 70 3/4ton- gads, probably 25 years ago now
Also, Greg64, as a fan of TBI's I can appreciate your setup- I bet it gives pretty reliable performance.
Dual TBI's is do-able, but would likely require some ecu changes- probably additional drivers for the injectors. thirdgen.org and/or
http://www.dynamicefi.com/.
S-D