So after looking into the mass of ideas from OEM and aftermarket intake manifolds, I’ve decided on a design.
It’s a long runner, fairly large plenum, and big throttle design.
Here is the preliminary layout.

The long tubes need about 3″ cut off the length, then a slash cut on the top. The injectors will be at an angle toward the firewall, they shouldn’t interfere with the heater hoses. I’ll only be able to use the shorty injectors from the looks of it. Good thing I have those, instead of the tall ND/Rochester style.
I’m going to attempt at drawing the whole thing in cad first.