I'm kinda with greystreak on this. EFI is certainly the way to go.....especially for an off road vehicle.

Now, that being said....I'm old school. They didn't have the aftermarket EFI conversion kits they have now......when I was building cars and trucks. A friend down here that does "rock climbing" and "rock racing", he told me almost all the guys are running EFI on their rigs.......because the engine will basically run upside down without stalling from fuel starvation. As long as it gets fuel, (and has oil pressure), it will run.

I talked to one of my old employees, who does EFI stuff.....make me understand!!!

So here it is in "laymen"s" terms. (So guys, don't yell at me if I quote something wrong!) Older EFI such as the Ford trucks and Broncos and GM TBI......worked basically on a "map" system in the ECM, such as a grid on a map. The ECM got info from the numerous sensors on and in the vehicle....but wasn't allowed to go outside the "map". It did the best it could do without "leaving" the map.
Now, as technology grew, ECM's advanced, and aftermarket realized they could "tweek" info going in and out of the ECM. Jumping to modern ECM's.....they are adaptive and "learning. They adapt to how you drive your vehicle.
(Yes, my head hurt after him trying to explain this to me!!!)

Bringing us to the aftermarket. There are several EFI carb to EFI kits out there. Accel, MSD, Mallory, FAST, and on and on! Most have multiple programs for different driving condition, some even come with a little LCD touch screen to program on the fly.
I'm not endorsing any over the other....you have to do your own homework on that! He, (my friend) told me they have done a few of them (conversions), one to an early Ford, "55" I think, and one to an early Bronco. He said they used the set up from FAST on the early Bronco. (Easier install and fewer hookups).
Hope this info helps, and good luck!

Lastly......be prepared to spend around $2000 to $3000 depending on the kit!!

 

Thanks for all the help guys. Like I said, and that price figure confirmed, I'm not ready for EFI yet. but this is all good information. you can never learn too much.

 

In this case the 4010 is a Holley-licensed knock-off of the Autolite 4100 and has actual fuel bowls vs. the side hung fuel bowls like a run-of-the-mill Holley, so there's that. Plus annual boosters.

As far as EFI goes, the MAF set-up that came on 5.0 Mustangs is some fine engineering. It's basically standalone. No need to spend big bucks on an aftermarket system.