Absolutely depends on the situation,I got a set done for $600 complete with valves,springs etc. and quality machine work.I then ported them myself and the flow peaked at 258 and 197 @.550 with 252 and 190 @.500,waaaayyy better than a basic edelbrock head can do with out some decent money put into porting-not too mention they need fluffin and buffin otb just to be right,you can aproach $2k quick to get those results.Basicly I would kick your *** with what you consider junk iron heads lol.