[Steve1968LS2]

Wet or dry sump? for dry sump you will need an oil tank and all the plumbing.

On a non-dry sump LS engine you can run any drive system from any other LS engine.. just make sure you don't try and "mix and match"

LS1 Camaro (4th gen) is good.. as are the C5 and C6 or even late model GTO. GMPP also sells a complete drive kit with and without AC

I'm not sure what changes if you stay dry sump since the LS7 in factory form has the double impeller oil pump.

The normal GMPP harness kit has the harness, ECU, throttle-by-wire pedal, MAF sensor, O2 sensors.. pretty much everything thing you need. I'm not sure if the LS2/LS3 kit works for the LS7 since I think the coil pack plugs are a tad different.

You will also need:

Fittings (adaptors) for oil pressure and water temp senders (for aftermarket gauges)

Consider the trans also.. engine placement might dictate a new or modified trans crossmember.

The LS7 crate engine ships with a TBW throttle body. If you want to go cable then a host of companies make them (FAST, Holley, etc) -- all crate engines ship with water pumps as well, but depending on the pulley system you may need to run a different pump. In the aftermarket Edelbrock makes a nice replacement water pump.