I'm just in the planning stages right now, but I'm looking for ideas on where to start. I have a 12v out of a 97. It ran faithfully for 310K. It has a cracked head and excessive wear in number 5 cylinder ( I don't know how much wear yet ) We put another motor in out of a wreck, so that leaves me with a builder. I'm going to swap this into an older pickup. This will be a tow vehicle and have a nv5600. How much can a 5. 9 be over bored? I have another 1st gen motor ( supposed to have a bad cam. Can I use the head from the 1st gen? I did notice that there is a notch for clearance for the p pump. Looks like I could make the notch with a grinder. Will probably have the head machined to handle a big single turbo, and do the bottom tapping and better head bolts. While I'm in there what internal mods are suggested? Strong,reliable towing is what I want. What turbo/injectors and fuel mods are suggested.