The LT1 is an 58-98 SBC so any aftermarket mounts designed for 2.8 frame cushions will work. I've used that combo for everything from 305 to 454. And have those lowers under an LS engine also.
Advance Adapters 713111 are the best ones made for your swap. Avoid any that have a square hole in the passengers side mount. That style moves the engine to the right and makes it more difficult than necessary.
All 89 up S10's have the steering shaft moved over to clear the 4.3 option so there is no need to move the engine toward the pass side.
Here's a good deal on the AA mounts you need:
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If you want to do it cheaper here's the same thing in a DIY welding kit. From the looks of them it wouldn't take a rocket scientist to position the tabs correctly. I'd use a piece of threaded rod with 4 nuts and washers to hold the side pieces apart slightly above spec during welding to prevent heat buildup from moving the 2 sides closer together at the top. Steel will move when heated if you let it.
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The Camaro World Class T5 shifter mounts 9.25 inches farther back than the S10 non WC version.
Here's how to swap tail sections and farther down is a discussion about getting the speedo to work on the hybrid T5 you created. Personally I'd use the 2.8 trans till it acts up from being abused. When that is, is up to you.
The 96 LT1 is an OBD II engine so you'll have some wiring to do, but since it's a 5 speed it won't be too bad.