\'70 Stang, 351w Headers

Can anyone tell me the difference between the Hooker modle 6901 long tube headers which are listed for Mustang/Cougar/Fairlane with 351w and the Mustang 351w swap version of the same header? I purchached a set of the 6901's off of e-Bay because they were listed for a '70 Mustang with 351w, then I see on Hooker's web page they also list a different number for a '70 with 351w swap. What gives? Will I encounter problems when I go to install them? My car was originally equipped with a 302.

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[addsig]

Funny thing. I talked to a bunch of header companies. Flowtech,hedman, hooker. Even talked to their "experts" HA! some experts. They all say that a 70 mustang did not come with a windsor! Only a cleveland! What a bunch of crap but that's what they believe!
[addsig]

Ya, I've experienced the same thing with so called Harley experts. I usually end up just figuring it out myself, which I will do with this situation. I can't imagine 1/2 inch more in deck hight is going to make a big difference. Thanks for your reply.