I bought a 68 formula S 383 4spd Cuda, original except for the fenderwell Hookers from a previous owner. I want to weld back in, the original patch panels that he cut out, & intall non-fenderwell headers. Are Hooker's available for this w/the 4 spd? Are the TTI's a better choice? What's the largest tube diameter that will work? Thanks for any info or advice. Buzz.