well bro going 1000cc with auto sounds good...
if you remamber ..some 1 spoted swift with 1000cc original auto.....they came with 3 gears
you have to find auto gear for 1000cc
1000cc carb which came in cultus from 2001 to 2007 also came with efi system on 3 cyl....they were in production with auto gears ....
but if you swap any cultus engine even a 1000cc...
that will require same amount of mount position change as g13 or g15 or even g16
baleno and cultus and margalla have same points...but khyber has lil different
1000cc will cost same as 1300cc or 1500cc......but then with CNg and ac it will be to much underpower
example is vitz 1000cc engine..on CNg with AC..some time ppl complain...but still that engine is 4 cyl and EFi and has almost 20 more hp then these engines and torque level as well