Sorry if this is in the wrong place, feel free to flame or move if necessary .
I'm working on putting a 2003 5vz into an 85, (frame up build, learning everything along the way). I read in some vague posts that earlier motors were better (199.5-2000). I didn't see any of the reasoning then, but now I have. The plan was to use a ford gas tank (pretty successful from what I've read on pirate), but I've run into a snag... the 2003 fuel pump has the vapor pressure sensor embedded, and I don't see alot of possibilities for moving it over to the ford. I understand (now) that the earlier motors had the same sensor up in the engine compartment along with the canister and rest of the evap stuff (vsv's, etc).
I'm considering my options now. What I'm researching is if anybody has tried to retro fit 95.5-2000 evap system to the newer style motors (I think it started in 02 but could be wrong).
The other options I have is to ditch the ford tank, and simply custom mount the 2003 tank (I have a mock up in the garage now that will work).
I'm not sure how many other problems I'm going to have working with the 2003 motor (I'm reliably told that the wiring is about 10x harder (I get to learn wiring next), so I'm also contemplating (worst case scenario) of simply getting an early motor and selling this one.