I agree with everyone else....do air first and if someday that isn't enough, look at fuel. As already mentioned, the problem with going to bigger injectors is you will have to upgrade every component of your fuel system to optimize their performance. This would mean a complete LP system (Air Dog, FASS, Aeromotive, or Fuel Lab). Then you would have to modify the high pressure side. The only reliable way to modify the high pressure side is to go to dual fuelers. There is only 1 option for the 6.4 as far as a modified HP pump are concerned....the II dragonfire. The dragonfires are notorious for ch#ttin to bed and when they do, they tend to take your injectors. IMO, the dragonfire is a poor option. Personally, even though it won't give any additionally power, I think a LP system upgrade would be a good idea. That upgrade should help protect your HPFP and when these fail, it can be a PIA....ask me how I know.
Anyways, so what to do now....a tranny upgrade will be eventually be needed. If you don't do it now, make sure you have enough money saved to do the upgrade when it dies. Head studs are nice insurance and they are an excellent opportunity to do upgrades (cause the cab will be off). Personally, IMO if you lift the heads, I would go ahead and upgrade the push rods and valve springs. I would also replace the rockers and lifters (with OEM). I wouldt definitely swap to 6.0 exh manny and heavy duty up pipes. I would also look at upgrading your turbos (or at least the Atmo turbo). After a tuner, the atmo turbo upgrade is the best bang for the buck to get more power. It also lowers EGTs too. After that, you have to decide what your budget is and how far you want to go. As to which turbo, it depends on your budget.....but a 71, 72, 73, 75, or 76 are all good options. A ported intake manny is also a nice upgrade. Like Fatboy said, do all of the little things while the cab is up...T-stats, tensioner, etc. Good luck
2008 F350 ZF6 daily driver
No Limits CAI and every air mod, MM w/ GH, DPF/CAT delete 5", Sean's 4" DP, SB DD 3850, Coolant Filter, Bushwacker flares, 2.5" Icon level, SD inserts tailgate/grill, PMF Tbars w/ 5" block, Elite EGR delete, Junior High Power Atmo, ARP studs, A-1000 (Marty's), Fuel Bowl Delete, 15% nozzles, Tial WG
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