Are you looking into doing a 3.4 conversion yourself?  There are lot of things to be concerned about.  First you have to source a complete conversion. Dealing with wrecking yards and tracking down all needed parts to this conversion can be costly and time consuming running back and forth to the wrecking yard.  Secondly you will need to research how to perform the swap hopeing the info you get by searching online is accurate and applies to your application. We source you a complete engine, do all the research to insure compatibility and  perform all the necessary modifications, fuel lines, drill hole in block for dipstick… ect ect ect…  We will need several parts as well as wiring  from your 3.0 donor vehicle.  We send you a ready to bolt in and plug in 3.4 5vz conversion . Starting at $3500 these are tested used engines with average mileage of 100k miles. Lower mileage engines are available.  We take the guess work out of the  conversion and  send you a bolt in conversion that can be completed by the do it yourselfer in a weekend.