I went with the Howell setup myself.
1. Yes, Starts up instantly and holds a solid idle regardless of temp and, in the 8 months I have had it not 1 single stall.
2.Direct from Howell, 4WD, Quadratec, Ebay. etc...
3. Usually they run for right under $1000 on ebay.
4. Easy, as long as you take your time. The actual install part is cake. The hard part is sorting through all of the old wires and deleting what you no longer need. I would plan on 10-15 hours to install.
5. Everything is included even the zip ties. However, Depending on what air cleaner you are running you may need to buy a new one. The factory one will not fit but you can pick up a generic filter from autozone for ~ $20.
1990 Jeep YJ 4.2
Howell EFI, BDS 3.5" lift, M.O.R.E 5/8" Boomerang shackles, 1" Daystar BL, 1" JKS MML, TFI, Crager soft 8s w 35" Dunlop Mud Rovers, Ford 8.8, 4.88s, Dana 30 E-Locker, Terra Flex SYE, Tom Woods CV shaft, Warn M8000.