You should be able to get the tranny adapter from somebody like transdap or gmpartsdirect look um up on google and see what you can find. Street and Performance does have the motor mount adapters and wiring harness but they are way overpriced. You will be about 200 bucks or more ahead if you can get an LS1 harness and send it off to speartech and have him modify it for you. Also campanies like brp (
http://brphotrods.com/parts.html) and ATS (look for their sponsor logo on the left side of this site) make different style brackets they may place the motor in a more ideal location for your camaro. Check out
www.ls1tech.com if you haven't already look in the conversions and hybrids section. Do a search on camaro ls1 swaps and that should answer alot of your questions. Also post up any questions you may have there and you will find many answers from people who have already done this swap. Good luck I will be undertaking a similar task this summer when I put an LS1 in my chevelle.