Josh it makes no real difference what came stock. all you need to know if it fits into the yoke on the 9" or not. BUT stock 3rd gen from 1985 up i believe were all 1310's. my ford 9" from a bronco was also a 1310. i used a stock driveshaft. if that housing has a 1350 yoke on it, get a 1310/1350 ujoint and your done. a stock steel drive shaft will handle the load of what your doing. unless you spray it out of the hole or sumthing you'll be fine.
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1998 Firebird:buncha parts thats used to make it go fast..... not so much anymore. 
BAAAAAA!!!!!!
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