So I'll share it here now, instead of when it'* done.
My hood on the 93 needs to be repainted due to blistering and peeling of the clearcoat. Prime opportunity to install functional vents. I started looking for good donors about 3 months ago when the peeling started, and found some good candidates in the GTA Trans Am'* from the late 80'* and early 90'*.
I got several from Ebay in an effort to glean the best pieces from them with the intent of passing along the unused vents to a member here. When I'm done, I'll post the sets that are available.
I've figured out the layout of them already, and I'm going with a full set of 4. They should do wonders for underhood temps. When I'm done (these will be color-matched), I'll post pics and before/after temps. I'll also provide detailed drawings, dimensions, and pics.
Another member is working on something similar, but has chosen a different location for the two large vents than I did.