google E30 manual conversion for all the information you need. on a right hand drive car its just a nuts and bolts conversion, only have to short two wires to ground to get past neutral switch. RHD has a seperate reservoir etc for the clutch, but we still have the same brake reservoir with the little nipple on it so there you go.
I highly doubt any E34 parts will work for the E30 though. they are very different anaimals as i have found out. E32/E34 yes, E30/E34 not so much. E34 pedal box definately wont fit. but this experience is based on RHD cars of course, so LHD may be different, but i doubt it.