Looks like it's going to be headers.

[Darter6]

But they look soooo good !

 

[themechanic]

The coated TTIs look great new but the shine fades over time and they will eventually rust down low; Just ask Dennis and me.

There are new tools on the market today for changing spark plugs that voids that excuse not to install headers.

I scratched the crap out of my headers when I had to change the mini starter.

 

[moparedtn]

I think I'd run stock HP manifolds at that engine output level as well, all things being equal.
But...
For the love of God, DON'T get Hedmans!

 

[Ernie ingling]

Headman how old are you? What happened to Hooker?

 

[moparedtn]

Headman how old are you? What happened to Hooker?

Apparently younger than you - and young enough to know both are still in business and quite popular on the Summit and Jegs sites.
Properly spelled examples include:
https://www.holley.com/products/exhaust/headers_and_exhaust_manifolds/all_headers/parts/5903-4HKR
https://www.hedman.com/product-detail/78036

 

[Cranky]

Hope you're talking about 350 horsepower to the wheels. Heck a factory 440 high performance engine came with 375 horse at the crank and these days it's pretty easy to get one horsepower per cubic inch. And whatever you decide to get just make sure the flanges are flat. A very large flat file can be your friend but the tti's that I have for my car look pretty good as they are. The cheaper headers usually have a pretty crappy gasket flange but that can usually be cleaned up.

 

[Mark1972]

Thank you for the replies. Very helpful. I'll be making my decision soon after I get a chance to read all the responses. As far as the specs for the engine, while it won't be dyno'd, the builder said we would likely end up in the 400hp area, or slightly less. In response to Yella71, how would I know what would work best for me and what the experience of others has been if I didn't come on the forum and ask first, before just buying something? Locally, HP manifolds when you can find them, go for $1200Can, or about $900usd. So it makes sense for someone making this decision for the first time to ask about options. I asked the engine builder yesterday as well, and he said he runs Doug's, and loves them. So I will consider that as well. Once again, appreciate all the help.

 

[65-440]

And ........ I would recommend remflex gaskets

 

[vintage chromoly]

Remflex are well worth the money. I run them on my boat as well as my 440.

And ........ I would recommend remflex gaskets

 

[Mark1972]

Thanks again for all the input. I have decided on Doug's, coated black.

 

[khryslerkid]

I asked the engine builder yesterday as well, and he said he runs Doug's, and loves them.

I love my Dougs. I even bought the black painted ones and they still look good after two years. You will need the Dakota mini starter on the Big Block. They're a great compromise in cost other then buying the top dog TTIs. They are well made.

I see you're useing the 452 heads. They have a ridge that will interfere with the header flange. Quick fix is to grind/taper the header flange before installation.