Won't start; Doesn't want to run
If it makes you feel any better, you are having typical issues people see with old Jeeps that are starting to wake up and run in a second or third lifetime.
Because you had what looks a lot like a fuel line issue, I'd clean out the lines again to get that last little piece of crud out of things, Check the fuel filter again - it may have loaded up.
A backfire usually isn't a fuel issue - it says that a valve was open at the wrong time. I wonder if you could have a valve sticking open?
The oil light coming on is a new one to me. It may be totally unrelated to everything else. Any noises that would indicte low oil pressure at the time?