ae71 is not a ke70.
different engine crossmember with an A series engine.
and t50 gearbox.
a T motor will never bolt up correctly to a ke20 xmember.
as ive done the conversion in my ke35 and if i was to do it the way people suggest with X mounts and shit the engine fouls on all kinds of things.
but it depends if ur running twin side draughts or ur goin efi.
personally i wouldnt use the shit efi that they came with they are an old motor so use carbies.
ur best option to convert it to a te20 u will need either xmember from the states or japan. good luck gettin one. or make custom engine mounts.
its not hard. i did it and i can't even weld very well. got a mate whos a coded welder to tig them up for me.
my 5cents