1985 Chevy Suburban change 4 bbl carb. To equivalant t.B.I.

Have looked on internet but im finding racing applications. Would like to remain stock but use new parts. Trying to convert this for my dad. He says the ethanol in gas back in the 1970's was murder on carb. Gaskets and he sees that ethanol made a comeback in gas again and does not want to rebuild the carb. Every so often just for bad gaskets. Any new info, insight or just a nudge in the right direction so I can find parts would be apprecciated.