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OK - read this:
How HEUI works and best to convert Deadhead makin' more sense now?

Here's what I'd do - especially if ya wanna make HP. Replace the engine-driven fuel pump with electric, internally-regulated fuel pump. Replumb factory fuel system to deadheaded including relocating diesel filter under cab. You will use the front ports on heads to feed diesel (thru a checkvalve). The VO system will have it own internally-regulated pump and fuel filter (this is incorporated into the V3 module) and will feed the rear fuel ports in heads. I think this is what ya get from DFA for an OBS truck - no need to modify anything 'in advance' - they give you EVERYTHING you need!

As for heat, the Frybrid in-tank HE is unbeatable. Besides NOT heating the whole tank, it get the fuel coming out of the tank HOT very fast. This is not only good for the engine (hotter VO faster), it makes fuel filters flow better and ultimately last longer. My opinion is the hotter the VO, the less problems you have. Not only that, with enough heat - you can burn bacon grease in Alaska! Or just any 'ole high fats, hydrogenated oil you'd normally find. Some studies have shown VO has increasingly better atomization up to 300*F. In a nutshell, coolant is not capable of 'hurting' the VO. I'm comfortable with coolant-temp VO, about 200*F in my trucks with a 203* t-stat. This temp is given another bump 'in the heads'. I have Frybrid in-tank, TIH up to V3, then TIH up to a 16 plate FPHE and out to heads. I see 160-170* VO before my VO filter. Many, including DFA would argue there is no reason for the amount of heat I have, but its hard to argue it can hurt anything and I don't know many people who see the kind of VO filter milage I do. 150k miles of success makes me biased too...

The DFA tanks have an aluminum coil across the bottom of an (unbaffled) RDS aux. fuel tank. They also use HOH and no final HE. Seems to work good for most people.

I got over trying to 'save money' on my system components early on. If 'overkill' means I continue to have the unwavering success I've enjoyed, I'm all about it. I have never had a VO-related problem in all of those miles...

One more thing - I use inexpensive Mercedes aux coolant pumps on my PSD's. Even with all the heat I have, I saw very low VO temps in cold weather when there was no load on engine - ie, sitting in traffic or just low-speed driving around town. The 'problem' is two-fold. One , these engines are very cold-natured. Diesel's in general are very thermally efficient, so at idle and low-load most of the heat goes out exhaust. Two, at low RPM's the water pump is not moving alot of coolant. Low flow = less heat transfer to the VO.

Be sure to let us know what ya end up with! mmmmkay?