Re: Diesel 6.0/7.3 L vs Gas V8/V10
I have a 5.4 and a 7.3 now, had a 6.0. I've driven them all, converted them all, spent many many hours weighing the options with guys. My opinion is that it depends on how you'll be using the van. If you tow a lot or plan a full interior, diesel or V10 for sure. Diesel will have a higher initial cost as well as maintenance thru its life. Gas will be cheaper to maintain, but will cost you more in the fuel dept.
My 5.4 is a pass van that doesn't tow, so its fine. 35" tires, 4.88 gears. I have occasionally towed 3-5k locally, so it will get the job done if asked.
Do some calculations, initial cost, x miles a year, oil change & preventative maintenance, est MPG's. It may take quite a few years to make up the difference!
02 E350 7.3 (V4)
05 E350 V10 (V7)
17 Focus RS,90 SHO,49 Willy CJ2A