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you may have to keep 120y booster/master but i would think you could swap in the 180b one, keep all the 120y steering stuff, use 180b struts, id say you would have to keep all 120y rear suspension
Actually 180B has exactly same master cylinder and booster as 120Y. Both has bigger booster from -75 upwards. Even 240K-GT has same setup. For LHD models you probably want to use some booster which sits closer to firewall, at least if you use
dual twin-choke carbs, reverse-mounting original is other way to make more room.
If you use 180B x-member and struts you sure want to use all steering things from 180B too because track length will rise about 2", and they all will bolt straigth in as 120Y has mounting holes for 180B streering box etc.
120Y's original diff is weak, it'll probably break very soon and it's basically good idea to use at least H165 from 160J or 180B wagon, it will bolt in with some easy modifications.