Cool exhaust systems on a /6

Oh yeah, pay the Dutra guy more for iron manifolds than any steel tube headers cost. My big old butt.

Dutra front is $225 - you can mod your own back half, he has directions posted.
Mine Y's into a single exhaust, per what you said.

Hookers are $480, or $750 coated, from Summit (and I think they're '67-'76 only, no love for early As):

https://www.summitracing.com/search...y/mopar-inline-6-cylinder?N=4294924068+400390

Clifford are $399/$429, if they ship them, and there've been reports of warped flanges: Mopar
Works with early A's, but supposedly not with Power Steering (Dutra Duals work with PS in my '64)

There was a guy on slantsix.org that was having someone cast some new Hyperpak headers based on a modification to an original set, but his wife is having health issues, so that's not come to fruition yet. I think he was asking people to chip in something like $650/set to get an initial run cast and machined.

Aussiespeed has headers, too - $575 ($695 for the Early A version) - those may be Australian dollars, in which case they would be about $415 - $500, plus shipping from down under.