I can't think of any under car headers that work to maximize the power potential of a Pantera.
The all have some sort of issue.
Halls headers can have a real collector installed on them although because you are threading the header through the rear suspension it is going to be smaller then what you would want on a set of "drag race" stile headers.
Those would be 3-1/2" diameter by around 6" long.
IF one wanted under car headers and was going to modify them with a collector, Halls are as good as any to work on.
What I would do is match the flanges to the heads and work with an uncoated set. Modify them to fit, then send them out for coating.
The "GTS" headers as far as I know are just made for the 4v iron heads.
The biggest change on aftermarket 351c heads is going to be how the exhausts bolt up and as a result, what flanges the headers are made with.
The Hall set that I have were made to fit the original A3, B302, C351 aluminum Ford "Motorsport" aluminum "high port" heads. Some aftermarket heads went with that design, some didn't and went with the original 4v iron head design?
So if this is still the route you want to go, then whether or not they fit your heads depends on what the exhaust ports of the Trick-flo heads are made to fit? I'm not familiar with them.
If you are interested, PM me, and I'll show you pics of what everything looks like on them?
These look like the original 4v pattern? What header gaskets does Trick-flo say to use on them?
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