I'm helping my father-in-law monday swap out his diesel for a 350. Thats what he wants. I need to find reasonable prices on the following parts and will need them in hand by the end of the month. Please give me some suggestions/with part numbers and places to buy. Thanks ahead of time. Truck specs are: 84 GMC Dually 4x4 6.2 SM465/NP205 60/14 Custom fab bed Custom winch bumper Heavy duty work truck. Welding rig. This truck is drove everyday to and from work. Has to use 4x4 daily as he is a pipeline welder and the job sites are fairly nasty. Need ASAP 1. Headers (shortys? or 4x4?) 2. 670 Holley avenger 3. good/ dual friction clutch setup Later additions 4. Regear 5. Lockers/limited slip front?