Good work! My son & I recently completed (well almost complete) a similar build. Will address a few things that I read here that might be helpful for you.
- We did relocate the battery as was suggested Burntz. It worked out very well.
- We located the PCM on the firewall just behind the washer fluid reservoir.
- We did use the 2010 Camaro exhaust manifolds as was already mentioned here. My son's car has power steering and the gearbox is larger than the manual steering version. So it was very tight and this was the only manifold that we found that would fit.
- We used the stock fuel tank. Our pump is a walbro inline and a filter/regulator from a Corvette. We did run a new line as well. It all worked out very well.
- In our case we did build our own harness by starting with a truck harness that was very inexpensive. But sounds like you already have that covered.
A few pictures showing the PCM location, part of the battery relocate etc. can be seen here:
https://plus.google.com/photos/101356112529572758733/albums/5898085092700489697?authkey=CIj498Gr16CyygEWe can get you some other pictures etc. if that would be helpful.
Great work! Anxious to keep tabs on your progress.
Todd