Best Bang For The Buck 351M Heads

[HenryFord.JR]

I own a 1980 Bronco with a factory 351M 2 barrel carb and a 4 speed. The body and paint are in great shape and nice soild driveline,but I'd like to get it breathing a little better. Ordering a cam and a 4 berrel intake is the easy part but the heads I wanna do it right and I wanna do it once. Should I get some 400M heads or what are some other opinions? Thanks...