For starters is the 120Y manual or auto? There are a few ways of going about it. If you hunt through the tech section you will find the info that you need. Some have done it by fitting a 180B front crossmember and some have used a modified stanza crossmember.

Personally I did not like either of the conversions as it would introduce bump steer. I used the mounting sections of a stanza crossmember onto my origional 120Y crossmember. Mine is a very neat fit. Have a look through my photo's and see for yourself.

What area are you from? There may be someone in your area that has done it all ready and may be able to assist you further. There is alot more to it than just bolting the engine in. But it can be done very cheaply.