Go to www.ls1tech.com and check out the conversion section. Plenty of info there for you. Just do a search for Nova. Also...most of the 1st gen F body stuff is the same. Im in the process of doing an LS1 swap into my 73 Nova too.
LS is definitely the way to go in my opinion. There are several people who've done the LS swaps. Stangs4sale has done quite a few. ls1tech.com is also a wealth of resources with several LS nova members.
It is adding up faster than I thought, but doesn't everything
Just find a person that has done exactly what you did, and pick there brain. It seems there many ways to skin this cat, and if you do not use the same mounts, headers, plates, ect you might not be happy.
Wish I could help more, but just buying parts right now, that is until the 454/th350 sells, then it is time to get down and dirty