Header options for 351w stroker in 71-73' mach

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Stangman73

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I currently have a 302 with c6 transmission in my 73 mach 1 which I am looking into getting a 351w/408 stroker crate motor for. On the motor it has dart pro 1 heads which have a slightly raised exhaust port on them .135" or 1/8" and angled plug connections. I have been having a hard time trying to find some long tube headers (preferably 1 3/4" primaries) that will fit this application as 351w didn't originally come in these years. Fpa's website show's that they offer them but that is not the case according to stan as the 71-73's have a larger steering box. Is anybody running a 351w/stroker in one of these year's with dart heads? And if so what are you doing for headers? Any info is much appreciated. Thanks 

 
Not sure if its an option for you or not but, we went with a mid length header on my wife's 70 with a 351W. They were Doug Thorley ceramic coated ones. I did have to massage one of the tube slightly at the aftermarket steering box. We were worried about ground clearance. They were a little pricey but were a very nice set of headers.

 
I have a 351w in my '73.  The headers are "summit" brand, ordered from summit racing.  I guess they count as long tube.  They had a 3-bolt collector flange that extended down around the transmission.

 
I have a 351w in my '73.  The headers are "summit" brand, ordered from summit racing.  I guess they count as long tube.  They had a 3-bolt collector flange that extended down around the transmission.
What transmission are you running in your 73?

 
Wondering if you ever found a set that works well? I have a 351W with a 5 speed (Tremic TKX).... also trying to find something that's fits well.
Thanks!
 
Wondering if you ever found a set that works well? I have a 351W with a 5 speed (Tremic TKX).... also trying to find something that's fits well.
Thanks!
I have JBA's for that app (though older Tremic 5 speed) that I hope to have installed when I get back home in September.
 
The JBA's needed a bend fabricated/welded on one tube to clear the steering box. That said I also swapped the Tremec for a custom AOD so not apples/apples.
 
I don't believe the steering boxes on our cars are wider than the earlier ones. Even if they are, out engine bays are wider.

Hedman has 351w headers that fit '71-73s:

https://www.hedman.com/product-detail/88650
I installed these. Also running a big aluminum headed 351w stroker. These are nice because my car is low and they are just long enough to be out of the way and short enough to not scrape the ground. They are also ball and socket at the collector so you have some freedom with alignment. Im fuel injected and so far they also seal real well. Not getting any funny o2 readings. These fit right in. I'm a 5 speed power steering car. Just had a hard time tightening the bolt by the number 7 (I think) cylinder because the header tube is kinda in the way.
Just FYI.
 
The prior owner of our 73 Mach 1 replaced the original 302 with a Street/Strip 351W. He selected Hooker Long Tube ceramic coated headers. I do not see any modifications for suspension (or other) paerts having been made. They fit well, but when I replaced the C4 with an AOD I did have to grind away as a little part of the bellhousing to provide some needed clearance for the passenger side collector flange. Not a big deal, it took a few moment with a hand grinder.
 
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