The 4.0 can handle a 5-8 PSI with an AFPR that raises fuel pressure with boost pressure. It's not a spectacular way to do things but if you have a wideband then it is fairly safe.
As far as timing, as long as you run 93 octane you shouldn't have an issue with the stock timing maps but you can always put an MSD box in or something.
2006 Honda 919
1994 Jeep ZJ
2007 Nissan Titan
1997 BMW 328is