I've got myself 3dr seats but only a sapph dash at the moment, will that go in?

Not to worried about intrior too much, as long as all the mechanicals go on it really.
Just thought i'll probably need to chage its fuel tank too as it wont have a swirl pot coming from a 1.6 shell.

Are the drive shafts,diffs, rear beam,suspension and brakes all the same then yeah?

Cheers!