If your going 2wd then just use the full front end(hubs, brakes, rack, crossmember etc)
From a 2wd and it'll all just fit straight on,
Thats what i've just done
As said the spring rates will be differant but i'm going coilover so will be specced accordingly
You'd slso be better off puting th full rear beam off a 2wd on it as well as its stronger,
And again if you swap over the full thing then it just fits straight on,
Prop needs shortened, cant remember the exact amount off top of my head, if you need the measurement let me know and i'll check it
I was told that you can use the prop from a rx8 as its a straight fit,
But i dont know if this is true as i already had my prop shortened when i was told so didnt look into it any further