head gasket went out in my 94 4runner so i planned to rebuild the 3.0 and just keep it simple and stock but then I got a great deal on a complete wrecked 3.4 4runner

the donor is a 3.4 2wd auto so from what i understand i need to find a 4wd auto trans and ECU from the same model and year and i should be good to go on the rest.

hoping to have this all done by end of summer since i only have weekends to work

Is there anything else i would need that my 98 wont have?
Can i still use the 2wd engine and body harness with the 4wd ecu/tranny?

after the swap is complete i am planning to do a solid axle swap so wont keep the IFS or ADD.

planning to have toy only swaps build my harness or possibly take it to Denver to rock toy industries and just have them wire it in ether way it is about the same price!