first things first... the motor is called a 1jzgte not 1jzgtte
things you must also learn
engine types/models
examples
M series engine
JZ series engine
1G series engine
none of these engine numbers/letters are the same... i.e.. you cannot interchange parts
so to answer your question can 7M parts be used on a 1JZ, the answer is no
can 2JZ parts be used on a 1JZ... yes
your hardest part for the gearbox is finding a jz bellhousing (not sure if you guys get these over there, more than likely do, but you could get a w58 bellhousing from a jza80 non turbo mk4)
otherwise you would be searching in japan for an jz series bellhousing for a r154
good luck with your search
in my biased opinion i would hope that the 7m would prevail