Other than the stock 2.8 there's only 2 oem cams I know of, the one that cam in the 3.4 93-95 Camaro / Firebird or the one that came in the factory S10 3.4 / 2.8 swap engine. The cam that came in the 3.4 swap engine was designed for the S10 and better low end.than the camaro firebird cam. Doubt it's still available new but I can get you the part number if you want it. I have the S10 3.4 factory engine in an 87 s blazer and it is great.
No, I swapped in the 3.4 that was offered by GM thru the Chevy dealers, it wasn't cheap but it was a new engine not a rebuilt and had a cam design for the S10. I still have the factory instruction sheet and parts list.
Camshaft # 12363220 Lift .426 int. .216 exh.
Typically a longer duration cam moves the power up on the rpm scale all else equal. The 2.8 doesn't have a lot of low end torque to begin with so if you want low end don't go wild with the cam. Either the camaro 3.4 cam or the 3.4 crate engine cam I listed would add some power but the crate cam more at the lower end. Some one had the crate cam for sale here some time back...a used cam would have to have the lifters in the original order or new lifters.
You might try a company called Delta Camshafts located in Tacoma Washington. I've got some great camshafts from them in the past that give a bunch of bottom end torque for smaller displacement motors.
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