Post some pics, if you can. Sounds like a fun project!
You might run into some problems with that swap, but I figured you've already solved most of them.
I'm a little rusty on the details. I'd think you have several problems to solve:
Getting the engine into the car requires the two-piece front-sump oil pan. I believe that pan requires an oil dipstick that wants to be where the serpentine drive setup lives. That'd necessitate a conversion to the v-belt accessories if so. I had hoped to run the early manifold with the later accessories, but I sold the car before I got to it.
I think the DISA manifold is too tall, so the older two-piece plain runner unit would be best. You'd likely also need the rest of the AFM intake snorkel to suit.
I'd expect you have the M42 version of the G240. The dual-mass M42 flywheel setup is a little hefty and IMHO overpriced. You can get away with the M20 G260 clutch, but it'll need some slight modifications, a compatible starter and perhaps a replacement TOB.
There's some little bracketry that doesn't exist on the six-cyl E30 you'll want to add as well, like a coil pack bracket. Going with the COP setup would solve that.