New to these trucks.

[Voodooracer]

Having some issues witht the headers I bought for my 67. The motor looks like it is to far forward and that is causing a lot of issues with the headers clearing the perches. My ? is, do I have the wrong perches or do I just need to break out the blue wrench, grinder and welder? I thought the first exhaust port should be on top of the perch. And mine sits in between the first two. My dist. is literally 7-8 inches from the firewall. Any help we be appreciated.