If I'm not mistaken the KA has the same motor mounts as the SR20
Any SR20 Mounting kit will most likely work, That's not cheap though
Cheapest way to put it in would be do all the welding yourself, If you do this you could probably get by without replacing the drive shaft if you mount the motor to where it lines up with the old drive shaft. But a downside to this is the motor will sit farther forward.
Wiring will be a cakewalk, Just use the OEM setup for now all that you should have to wire in is the ignition and starter