Interesting. They have a "adapter" to put the standard inlet carb/tbi bonnets/elbows onto the vortec tb's. I emailed them about the measurements.
I measured mine and I have roughly 3 1/4, possiably 3 1/2 inches of clearance from the top of the tb to the hood.

Now that I saw that adapter they make, I never thought about simply making a "disc" of sorts that could let me use a standard inlet sized elbow. I bet I could find that same one on jegs or summit for cheaper. I could probably even make one of those, just never even thought of doing it that way! Only problem I see is actually attaching it to the vortec tb. Thats another thing I asked them, lets how long/if they reply.