[TeeJayHoward]

Cheap CIS->EFI costs about the same as CIS->Carbs
Expensive CIS-> EFI costs almost 3x the price of CIS->Carbs

EFI starts at approximately the same price as a carb conversion, but the prices go up dramatically from there. There's a lot of little add-ons. For example, where are you going to get your cam position from? Crank position? Gotta buy those sensors. Your existing fuel pump - does it produce enough pressure to support an EFI system? What about regulation of the fuel pressure? Do your fuel lines support the E85 tune you're thinking about running? The throttle bodies you're using - are they electronic? Guess you need a TPS. Oh, they're dual DBW throttle bodies? Damn, now you need an ECU which supports dual DBW, since most don't (or a little adaptor box). How are you going to handle the vacuum system for your power brakes and fuel fume extraction? Do you want your ignition controlled via the standard dizzy and CDI, or do you want coil-on-plug/coil near plug? If CoP, smart coils that're powered directly by your ECU, or do you need a ballast box? What're you doing for air filtration, and does it have a hole for your charcoal canister? Do your new throttle bodies fit with your A/C compressor? Are you okay with losing your heater fan in the engine bay? May need an aftermarket fan to compensate if you're dissatisfied with backdated heat. How about your Wideband - you've got a bung welded into your exhaust for it already, right? And your ECU supports it without a translator box? Your electrical system's all up to snuff? Where are you going to put the ECU, and does your ECU harness include enough wire to support that location? If the ECU's going inside the car, how are you running the wires, and what disconnects will you have?

Nothing insurmountable, just a ton to think about. You can end up buying the same components twice if you want to upgrade some aspect of the system in the future. I went carbs with my build. As a weekend car, it was the right choice. I love to tinker, and they look (and smell!) so good. Unfortunately, this isn't my weekend car. This is my only functional car. My daily driver, in 120*F or -20*F. And the 8.6MPG, lack of choke/cold idle, and lower power than a similarly priced EFI system isn't endearing it to me for this scenario. I shoulda gone EFI.