Line the inside of the airbox with foam pr rubber insulation. You can get it from most HVAC joints but Bunnings or other hardware stores may sell adhesive backed rubber or foam sheets of insulation.
Keep it above a ¼ and it'll be right. Unless it has a Holley hydramat or similar it has potential to surge. An anti surge tank is the only real protection against that. If KPM came up with a hydramat setup big enough for the sedan and ute tanks it would be very interesting.
Curious. What are you guys doing with the fuel pump MRA connector plug when upgrading the pump feed? I'm stumped on that part, doesn't look like there's any connectors that will take thicker gauge cable.