Rebuild 915 heads or go aluminum?

As stated before somewhat the same boat and have decided to go with the Sidewinder heads for around $1250 out the door what I like about them over the Stealth is that they are smooth and not cast finish - valves ground in house - springs to match your cam - angled plugs this you need to pay attention to I'm using Schumaker headers and these work with both straight and angled plugs but he says better with angled I know some headers have to be straight