stealth heads vs edelbrock heads

You pay for the engineering, development, startup costs, patents, and components. At least if you're Edelbrock. 440 Source gets paid for reengineering, reduced startup costs, and reduced cost components. But suffer from poor assembly line type assembly labor. Source also suffers from crappy valve springs, locks, and retainers. IMO, I like the Source straight plugs for exh manifolds and the stock look. But in terms of performance and personal choice, I'd rather have the RPMs or Easy Streets. they are about $200 more per head than the Stealth.