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I just got the X pipe system for my 70 I'm not real happy with the two crimps and the X seems to restrict the flow plus it hangs low by the rear spring. I think I'm going to send it back.
That's exactly what they're for. In all honesty, with the motor you're building, if I were you I'd send it back if possible and find a quality shop to custom build a 3" mandrel system. I have the Pypes 2.5" mandrel system but I'm at about the 500 HP level, which is around the flow limit of a 2.5" system. Additionally, my exhaust guy had to spend quite a bit of time to cut & weld to make it fit right. Thankfully he's a friend but, at shop rates on top of the cost of the Pypes sytem, it would have probably been no worse to have a system built from scratch.