Stock internals? Eh... 10. I would have ten be your max and have a 5-7 psi be your normal. 3.slows are not very strong engines. I wouldn't trust the stock pump. Better to upgrade to overkill and know that your safe on that end. However, at only 10 psi I think it will work fine. I don't know about the tranny but I dont think you will make enough power to make that an issue unless you beat on it all the time.
A Ranger would be good for a remote mount system, there is plenty of room under the bed of the truck to have a turbo tucked up in there. Just remember, its not really the PSI that matters, its the CFM that the turbo will push out. So go big and waste gate it down.
FORD: PRACTICING SUPERIORITY THROUGH EQUALIZED MEDIOCRITY SINCE 1906
Daily: 2000 Ranger XLT 3.slow 5spd 2wd. Fabtech spindles, Belltech shackles, Expo springs, 265/75 R16 Duratrac's
Track *****: 1986 VW Golf. 1.8 8v on a webber at 8k rpm, scale weight 1670 lbs.