need efi reliability

[72chevyplow]

well as my username implies i use my truck to plow snow among other things, this isnt a toy, I legitimately use this truck. The carb was neat for a while but I need my truck to start when I turn the key in -20 degree or colder weather. Basically I'm asking the easiest way to get efi, TBI is fine with me if its easier. I have access to a 5.7 vortec, all wiring and computer for absolutely free. The only problem is the short block on that motor has about had it at 427k miles without a rebuild. kind of looking for someone who has done a swap like this, how hard is it wiring in the vortec engine vs tbi? mainly worried about the ignition switch, is it hard to trick the computer out of the anti theft stuff? any info is appreciated, thanks.