What is the issue with your current engine? When I swapped 7AFE, these 4AGE or even 4EFTE are mostly were in bad condition. If you want to keep ur current tranny than find a clean 7AFE. Find aclean engine From pindi or peshawar. Uncut wiring and proper wiring job.
7AFE has a good low end torque and better than 4AFE or 5AFE.
Earlier gens of 7AFE also suffered from oil burning issues that was fixed in later gens so keep that in mind and find latest gen the one that came with coils instead of distributor and with lean burn function as well.