5.7 3ur and the 4.7 are very reliable. A non vvti 4.7 swap would probably cost about 35k or so. A 3ur swap would probably cost 45 to 60k. The LS motors are very reliable, and far easier to repair. And they are easy to get parts for. Both the toyota 5.7 and 4.7 are huge motors, so it would be a tight fit. Personally, if you don't have much of a budget concern, then I would go with a 7.0 liter LS7 erod motor kit from gm with a 6 speed automatic. Would be extremely cool and fun, and drive nice.