The iron Windsor Jr. heads have been replaced by the Roush 180 and 200 series. I've read several less than flattering posts about the lack of craftmanship at World Products. The Edelbrock Performer and Performer RPM heads are proven products for street driven vehicles. Although it is expensive, the AFR 165 head has posted the best air flow volume numbers during dyno testing. Keep in mind these dyno tests are conducted by pushing the limits on each engine component: cam, headers, heads, intake manifold etc. More than likely the price difference will range from $300-400 between Edelbrock and AFR. Hey, I'm spending YOUR money! (LOL) Hope this helps.
"What we have here is--failure to communicate."
67 GTA (clone) coupe soon to be 5.0L w/Edelbrock 1406