Aluminum Head advice needed

The said new/complete on Ebay with pictures including the springs. Being offset would you recommend these? Price seems good. http://store.440source.com/650-Offset-Aluminum-Roller-Rockers_shafts-16-Ratio/productinfo/200-1126/ they are 1.6, would that help me out a little if my cam is pretty mild. I think its 270-274 ish.