Let's see the car is a 93.
I'd recommend, a new timing belt change with water pump and needed maintnence items. Get the valves adjusted/set if needed. I'd also install new plugs, wires, distributor and regular plain old new air filter. And how about a good quality oil change.

The above is always a good start before pouring money into an engine swap.
The results can be surprising some times, may even run better, almost like new on some cars.