You had a tunnel ram with dual 4bbl throttle bodies already, right? I don't think it's going to pick up much but that is incredibly cool and awesome of your dad to pick it up!!

I don't know how the IAC is integrated on the Kinsler setup but I had a little bit of experience on the Roush crate motors with 8 stack injection. They were very touchy both for the IAC and the throttle/bellcrank ratio. Very small movements in blade position gets you a ton of airflow in comparison to a single 4 or dual 4 setup, so it ends up being jumpy unless you go with a progressive bellcrank and more pedal travel.