I am building the same eng for my 63 a Indy EZ headed 493. I bought the TTI 2" headers for $691. which are just the nickle coated. But we have nickle coated CPPA headers we bought in 1997 on my sons Dart and they are still holding up good. They do have a little surface rust starting in some area's but nothing bad. And my brother runs the same 2" TTI's on his 64 Ply which he said was no problem installing. I hope to have my 493 ready in a month to drop in. Ron