AE86 questions

I just purchasced a 84 corrolla hatch back sr5 and was wondering which engine would be easiest to swap in this car...... i was thinking of putting in a japanese motor but i noticed there are alot of diffrent options any help would be apreciated thaks.

i just relized that i should have read more in the forum sorry for the dumb question....

but i do want to still ask you if the AE101 20 valve levin engine . is it any good and will it swap in an older 86