What to do while the dash is out

[NewToFord]

I am working on my 4cyl to 408 swap. I am also switching the interior too. I have the dash out of the car now. I figure now is a good time to swap the auto pedals for the std pedals, install the brake booster. I already put in the computer harness, and replaced the heater core. Anything I am missing? Also is there a way to get the a/c core out of the heater box? I took the box out, but it looks like it does not pull apart.