Streight swap

I have a 1987 Mazda b2000 with a bad mottor been in the process of disconcting everything and pulling it. But the catch is what 4cyl mottor is going to swap right into it using all the Mazda parts I have already. There is a posobility I could find a Mazda mottor but that's a low chance.so what other mottor could I use???

A B2200 motor is a drop in replacement. If you could find a motor out of a Kia Sportage that drops in but there is more work to convert the truck to fuel injected.