I wouldn't swap in a 6.5 it's a lot of work to swap a diesel in place of a gas, to end up with an inferior engine. The vortec 350 is a much better choice. Now if you Wana swap in a Cummins or duramax that's a different story.if I were you I wouldn't swap over the interior parts you wanted from the green truck to the blue since the blue truck is so clean. what I would do is put the 6.5 in, lift it like you said and use it as a fun exploration type truck.