you can swap the brakes over and struts possibly, might hve to look at LCAs and stuff, if your 1200 is drum front you will need to swap brake master cyl over as well as drum will be a single unit.

rear leaves can be swapped over, im rumming 120y ones in mine currently with h150 diff from a 120y.

you will need to use the manual tailshaft from the 120y as well as the pedal box possibly as the auto will e mossing a clutch pedal.

also you need to mod the auto x memeber to match the manual box, as you will notice the auto tunnel is wider than a manual one.

i havent done that one, other members can help out there but doesnt look too hard.