Re: 86 c10 efi
GM did it in 1987, and in 1 tons burb and blazers 87-91.
Fuel sender and return line, change heads and intakes (or redrill, or use an adaptor plate intake to TBI), different distributor, add knock sensor if your block doesn't have one, add ECM and all wiring, O2 sensor, etc.
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1987 2 ton 
1982  250/TH350 beater in progress
Dad's 1981  3/4 L6 3 on tree posi and no options, awaiting restoration or scrapping
Plus a mess o' tractors
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