4l80e in a nova??

[novaracer]

I have a 68 nova that I am putting a 4l80e in I have the transmission (built by finish line w/rossler brake) I also have Big stuff 3 w/transmission control what else will I need to change? ( has old style 408SB not LS style )

Crossmember....will be custom made to fit
drive shaft (need to be shorter)
shifter (4 sp)
new lines (will be made)

what about the flex plate will my current one work? I have a th400 in the car now...
Did I miss any thing else? I would like to have every thing before starting so I have less down time.
thanks BC