Pretty sure GM part # for the small block bracket for rear of the power steering pump up to the front of the exhaust manifold and then the alternator, at least for your 1994, is 10118750 - there's a used one on eBay right now but it'll run you about $40 shipped. It's been discontinued by GM so you won't find it at most dealers.
It's a pretty common part and also is used on the 4.3 V6 applications including S-10/S-15 trucks so you'd be better off hitting the boneyard and score one for a few bucks.
(The one Peter posted isn't stock, stock one won't fit with headers like that engine has.)
Richard