I used the flexible chrome\copper ribbed radiator hose, however the lengths are a little shorter due to using a different radiator and inlet outlet both being on the drivers side.
Cant see your header tank in there yet either? Mine is attached to the drivers side shock tower (see thread link below)
There are quite a few pics of different setups in the old LS engine bay thread:
The LS1 to LS7 Engine Bay idea thread