I have a friend that wants to swap out a 4afe to a 4age 20v st. needs a new ecu and probaly new engine mounts. anything else i need for the swap and any links rthat i should check out for these things.

He'll need a 20V ECU and harness. It will drop in to his motor mounts and current transmission, as they are both A series motors.

I don't know if everything is similar to the Celica swap, but he might need a new throttle cable off of a Paseo, and depending on where the power steering res is located on the Corolla he'll need the entire 20V power steering setup.