witch are the best flowing 273 heads#

buy the iron magnum heads off ebay for $375 each assembled

brand new castings, 2.02/1.60 SS valves (might not fit on a small bore 273...), nice springs good to .550" lift, and they can come with the LA intake bolt pattern for LA intakes- you'd have to resetup the valvetrain (new pushrods/rockers ect..) but they'd outflow any production 273/318 head