Find a converter to convert the 2 bolt carb base to a 3 bolt carb base, then get a holley 94 or stromberg 97, that would do ya. But if you want original carb, www.chevsofthe40s.com has them for like $350 rebuilt/ gaurenteed with a core charge of the old 1, Ebay is also a good place to get rebuildable carbs, often times they'll sell the original intakes with the carbs still on them, often times will go for 10-30 bucks.