360 magnum build

do the 360 block instead

go to hughes engines http://www.hughesengines.com/Index/index.php

look for this kit
HUG 2090
LA SMALL BLOCK TOP END POWER KIT

comes with aluminum heads complete, intake, cam

really a better deal in the long run... same or better power, less weight, can go 1 point higher in static comp ratio than iron heads

just my opinion. you would be spending $1000 shipped for a set of iron heads.