I have a 65 fastback with shock towers in place and have just finished upgrading to Ford Racing Z Heads (from Trick Flow Track Heats). The exhaust ports on the Z heads are located very differently than the Trick Flows. As a result, my MAC Headers now have major clearance issues with the shock towers. I tried to clearance them to make them fit but ended up having to collapse some of the tubes so much that they are now 1/2 as thick as they were originally. At this point, I think that I'm better going with new headers. Can someone please advise my best option for headers? I'd prefer to purchase them uncoated as I will have to weld in O2 sensor and make sure they fit before getting them coated. Any advice would be greatly appreciated. Thanks!