how hard or easy is it to covert a carb sierra DOHC engine to injection, here is a list of all the parts i have already.

inlet manifold with throttle body
fuel rail and injectors
wiring loom
ecu
map sensor
spark amplifier
airbox with plenum chamber and intake pipe
idle valve
all pipes
header tank

i know i need an injection fuel tank with pump but is there anything else at all.