Matt,
You have the right idea - glad you are not bitter about your purchase. Nothing you can do but turn bad into good on this one.
It is a shame that people waste all the right parts and a good car and just not do things right. When I talked to the seller he made it out to be a showroom car that was built to the highest level of quality. Either he had no idea as that is what he was told when he bought it or he just felt he needed to sell it that way to recover his losses as well.
I build late model powered 69 Camaros all the time. You will have a great toy when you are done.
Here is a dyno video of the latest one we are finishing up. Very mild LS2 T56 setup pushing about 450rwhp.