Welcome to the forum mm. Not sure what the 605 box is. What do you mean without moving the old gear box? A lot of people have used the gearbox out of Grand Cherokee. It has a better turn ratio, the hose fittings are different but otherwise it's the same Saginaw gear box. They also make a power steering gear with improved ratio that is a direct swap.
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Hank
70 Chevelle SS396(454), M20, 3.73
My Chevelle
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