Recommend read up on the T5 swaps. Yes, an S10 tailshaft simplifies stick location in a bench cab, but S10 trans also requires input shaft spacing. The best of both worlds is a Camaro trans main body (no spacer required) with an S10 tailshaft. That, of course, requires two transmissions or a lucky craigslist franken-find. I prefer to use an S10 WC with a spacer. take a look
here
Keep in mind that if you change rear gear only, your granny gear dilemma remains. A 3.07 rear makes granny slightly less granny, but not much - but also note, 2nd gear will have less acceleration than it already has - and if that's what you start off in, you'll notice the difference. Higher rear gear (lower numerical ratio) only improves your highway rpm problem. Also keep in mind that if you do a 3.07 rear only - and then decided to add an o/d trans later - rpm a lower highway speeds would be too low and you'd risk lugging the engine. So, if you want to go the 3.07 "only" route, make sure you're committed to stick with your trans (or a trans with a 1:1 final drive), as most overdrive transmissions + 3.07 result in TOO high of a highway ratio and low rpm.