Ok here is the deal. No one sells a proper stud/bolt kit for 455HO intake manifolds. Not enough studs and/or bolt-studs.
And actually the photo shown in the inline tube link is incorrect as those stud-bolts shown are really just studs with a washer under the 'nut' on the stud. They are not shouldered like oem.
AMK sells the right "bolt-stud" at a whopping $12 each. Do it once, do it right. Ha.
https://www.amkproducts.com/bulk-fas...oduct_ID=15557