Superformance AFR Headers and fastener problem

[Pman1961]

I'm slowly but surely getting SPF #2423 back together after being down for about 9 months. I've gone to a 408 sbf and TKO 600 tranny in lieu of the 351 and TKO 500. Anyhow, I have purchased new headers and was going to install them this afternoon. The new headers are the AFR0031 or known as the 402 headers. My problem is that the fasteners in several location on each header will not go into the hole because the fastener makes contact with the header primary tube. I'm sure it may require a little hammer work or maybe use a dremmel to work the hole. Any suggestions that would prevent damage to the finish or how you would go about correcting this problem cleanly. It's getting into good driving weather and I'm ready to get rolling again. As always, thanks in advance.