OBD1 to OBD2 swap

[Spectre_240sx]

I'm in the market for a KA24DE and all of the low mileage KAs I'm finding are OBD2 models. Is it a big deal to put an OBD2 engine in a car that came with a SOHC KA? I'm thinking I'd need the following:

Long block w/ trannyWiring HarnessECUPower Steering lines (maybe rack too?)

Am I missing anything?

Alternatively, if anyone has a good lead on a low mileage DOHC KA that's OBD1, I'd be interested in that as well, though it's going to take me a few months to get all the money I need for the swap.