Re: Van chips...
I have a DP-tuner chip on my 7.3, not sure if they have anything for the V10. Lots of posts from people liking 5 star tuning. I know it's been talked about, do a search, should come up with some threads. Wouldn't mess around with a $20 eBay find, promising huge gains.
'03 Ford E350 7.3L Diesel
(de)SMB'd Custom RB-50
Quigley 4X4 w/Deavers & Agile Offroad's R.I.P. package
CCV High Profile Pop Top