I went from 6.2 to 5.7, and never looked back. you will need to replace everything from the radiator, which includes the whole support. To the governer in the 700, I'll be happy to go through all of what I know to assist you. But my advice, spend the 5000 its gonna cost for a slow ass 6.2 and put a healthy 383 in it and save 2000. I figure 2000-2500 for the motor,(a good motor, not one from a junkie for 1000). Another 1000 for the right alt, starter, hoses and all the other parts I'm not listing, it adds up, it really starts adding up.... then 500 for mufflers and exhaust, a complete exhaust. 500 for the radiator and support (or more, the radiator makes a big block rad look like a tranny cooler). 500 for the complete glow plug set-up, with the wires, selenoid and the firewall fuel filter and and and and.....forget the diesel, I never pulled anything with mine that a 350 couldn't handle. They stink, there loud, they leak oil like mad..some would say those are good points. Diesel by me now is 2.10 a gallon.....hell for that money get a rat motor and a bullet proof trans....js