Get Lemons headers...they'll fit....guaranteed. Not cheap but probably cheaper then "custom" ones and they are reasonably quick. When in doubt call them. You won't be dissapointed ..ask Vegas69. I have them but haven't fired anything up yet.
FWIW header wrap tends to hold moisture. It can ruin a nice sent of hand built headers. I learned that one the hard way.
I don't know if it was caused by the extra heat retained causing fatigue, or condensation held by the wrap, but a set of headers just crumbled away inside the wrap that were on a car I bought.
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John Paige
70 Firebird Esprit, 400 TA clone type "The 14 car"
lab-14.com
I have a 502 in my 68 convertible. I am running a Concept One quick ratio steering box and the Stainless Works headers bolted right in and do not hang below my stock subframe. About $800 a set I believe. Cheaper than custom ones......
Thanks for the heads up. The car is at the shop right now getting a custom driver side header made. I'll have it coated later I suppose.