Depending on the budget, Long Branch manifolds are great, and if cost effective, I might change over to them...

But if the budget is not there for that, then the next suggestion would be Hooker Super Comp headers (but still expensive) and then Headman good fit and finish anf good on price. You might save enough with them to get them coated and would be set. I've had both Hookers (which I have now on my 67 drop top) and the Headmans on my last bird. No problems with either... no leaks, minimal clearance issues etc.

It will be a tight fit, and the drivers side will hang down closer to the ground... so just expect that. Get locking header bolts, copper gaskets, and your set!

Oh, and I have an "H" pipe and 2.5" exaust that fits under my "X" pan...

Brett - 67 Drop Top 455!