OK, because of financial and time constraints Ive decided to put a 4bt or 6at motor in my truck. First off, which one would be better for my K5. It weighs in at around 5500 lbs and has 410 gears with 35" tires. Ill be using my SM 465 transmission which has no overdrive. Which motor would be the best for a lot of highway driving with a lot of offroading on the weekends. Which one is easier to bomb. Where is the cheapest and best place to find them. I live in Illinois so somewhere close to here would be preferable. Thanks in advance.