Most rear disc kits have a requirement for a particular flange and center register diameter. Will depend on the kit. Read the install instructions prior to purchase. For example, the Right Stuff Kit I just used on a non-C-clip BOP 10 bolt uses a axle flange diameter of 6 3/8 and a rotor center of 2.915 for the hole.
My axle flange pattern for the A body is a 3.375 center to center top bolts, and I don't see it listed on the Wilwood site. Yours should be a 3.125 on your 'bird, and I don't see that one listed on Wilwood either. I think their' chart may be off, might want to call them. Pretty sure they have rear kits for 10 bolts.
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1970 GTO Judge Tribute Pro-Tour Project 535 IA2
http://forums.maxperformanceinc.com/...d.php?t=760624
1971 Trans Am 463, 315cfm E-head Sniper XFlow EFI, TKO600 extreme, 9", GW suspension, Baer brakes, pro tour car
https://forums.maxperformanceinc.com...ght=procharger
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