gotta be with something you took off to install the long-tubes.. Check all your wire connections to starter from battery. Are you sure battery is fully charged?
Man - once you get it running you'll be very pleased with the long-tube headers. A pain to put in - but of so nice when job is done.
P.S. - if you steering linkage is rubbing the header tube on left side, you may have to replace your motor mounts. If so - use either Ford OEM or Energy Suspension mounts. As you've seen there's not a lot of extra room.
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