Ddont pay any attention to him. He doesnt give a fuck about any one unless your buying something off him or u got a really bad ass car.. and the bad ass car is iffy no adays. anyway whats the condition of the car? Tthat should be your first place to start. If its already a rust bucket i say go ahead and junk it. Just cuz its free doesnt mean its a good deal.
Ok so if your past that its not a bad idea since u already have the ka but other then that i would of picked many other motors over it.. But since u asked about it and your not the king of fabricaters like pb&j its gonna cost u alot!!
Munts need to be made drive shaft will need to be custom exhaust will need to be made wiring harness will have to be converted. Now thats gonna be over a thousand dollars right there. I know u wont be doing any of this work your self because if u knew how u wouldnt be askin this question. So that right there will get u running but your still not done. Since your putting a 4 cyl into a 6 cyl car your speedo and rpms will be off. Now u can say a couple diff things but i feel it will annoy you cuz u said it will be your daily and your not gonna want to start racking up tickets.. so know u have the buy this little dakota thing to make the gauges read close to right and hopefully who ever did your wiring did it right and made sure all other gauges work properly or your gonna have to go buy after market gauges and pay someone to wire those in.
all in all i like the idea, im not against ka's at all but if your gonna do a built like this i would go rb or jz since the room is there for a straight six.. even if you keep it na i would go jz all day.
if u decide to do it good luck but if u want a daily unless u have 2-3k just sitting around your not gonna be done with it very fast and you'll probably never get it done like paul said