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The 91 should be the same as the magnum engines. You will need a magnum timing chain cover and water pump, because with the serpentine belt the water pump spins backwards.
Thanks for the Info. now i know what I'm lookin for in the yard tomorrow...we will see if i do the serp belt swap. First I think i might take the air pump and the other smog equip bull **** off and go from there.