The is a book titled "How to build the LS1/LS6" that is helpful. There are plenty of info on this site of others that have done the swap in the 68 Camaro.
1986 El Camino - LS1 with 4l60e transmission and Drive-By-Wire installed and running as of 9/20/2005
. Drove it finally as of 10/15/2005