I am having a 351W style engine with 351 Cleveland heads built with a 671 BDS blower by a local speed shop for my 1971 Mach 1 with C6 automatic.  They are recommending that I have 2-1/4" primary tube headers.  I was wondering if anyone had any contacts that would be able to help me out.  The largest "in-stock" headers I could find are 2" primaries.