Gurney Westlake Valve Covers, fit Superformance headers?

Anyone know if the standard Superformance headers (351engine) will clear the reproduction 302 Gurney Weslake valve covers at rear cylinders 4&8?
 
I have those on my car and yes they fit, but it's tight on the LHS. I can't take that valve cover off without taking off/loosening the appropriate header pipe. Not ideal but workable.
 
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