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It really depends on why they don't fit! I've never seen any pictures of a 2wd 1st gen with long tubes on it, so I've never seen how they might fit. One person on here who hasn't been on in a while put mid-lengths on his truck.
Just to let you know the long tube headers are for race engine setups. Shorty headers are all you need for stock and modified engines. And there are shorties that bolt up in place of the exhaust manifolds. No modifications needed for them.
But if you set on long tube headers, find some with a back side drop. And you may need to cut or bend and weld in flanges or who knows until you find some and try them.