Taking a 1965 2bbl 273 to a 4 bbl or commando settings

Yeah I plan to completely replace the distributor to an electronic system once I get the money together to buy one. Would it be cheaper to drop in a 360? I mean I eventually wanted to drop a bigger engine in there, I was just assuming it would be cheaper to, maybe not do a complete commando conversion, but things like carb, intake, headers, etc.