There is a hole in the throttle plate. It's a Mustang GT throttle body, 70mm.
Yes I'm running an IAC. I was hoping to not have to adjust it from where it is now, it works awesome as I have it now. And I'd like to get the revs to hang just during shifts near specific RPM's. The IAC can't do that. Which is why I'd hoped timing could.
There's what my low load timing is right now.
Stock is ~55 down to 3K, then drops down to ~45.