Get your Camaro then build the truck. Lol, another driver helps with downtime.
Part of my suggestion for the 4.8 was the cheaper initial cost. Run it with a stock 4.8 while you build a stroker, or just look for that screaming deal. But a 4.8 isn't weak, it is a short stroke 5.3.
Camaro's are fun, find a nice one and enjoy it. My problem is I am 6'4", 230lbs. It's hard to get in and out of, even more so when you have broken your back a couple times.
An ls swap can be completed in a weekend if you have all the parts gathered. The actual swap isn't any harder than replacing a stock engine. Even the wiring is easy. Main issue is fuel system, and even it isn't hard, just have to get a plan.
When I said "no offense" I was saying not to spend money buying a fully built trans. Stock 4l80's take insane amounts of punishment. I have personally put 60k+ on one behind a turbo 6.0, and I have friends who have put more on them with more power. And, you can replace 5 of them for the cost of the built one. A trans built for 1500hp is overkill on a stock engine, and many of the performance parts in the trans hold better/shift harder, but they also wear quicker. You can pay more for a trans that won't last as long. I still suggest the regional forums on ls1tech, just because people there should be able to help you find good local shops. Cheaper, quicker and I always prefer a face to face transaction.