Re: Jr Windsor heads
Windsor Jr??? I know people call them by either name, but you mean World Products??
As I recall, and I may be wrong... Those are IRON heads... The typical aftermarket GT40 is aluminum(Ford did make them in iron as well). Big weight penalty for "OE" heads. Splurge... get a set of TFS or AFR's... Almost any aluminum head will be better in the long run.
The GT40 head is okay, but there are several better choices available. No iron head will be best overall, unless you're building a class specific engine OR you want the world to think you are using stock heads.