It appears no one makes long tube headers for a 351 in an SN95. I've heard that some have used Hooker Super Comps, part no. 6223-1HKR, that are for a Fox. Only fitment issue is the steering shaft, but with some massaging, it is doable. I'm assuming a 9.5" deck.
None of them fit good, if you can afford it, custom headers are the way to go. I have 8.2 deck kooks headers on my 9.5 deck engine and that helps with ground clearance but they are a PIA to install and have had to be clearanced in places.