My '77 coupe has an EZ30. Lots work there., But point is you really can do anything if you have some skills, time and access to metal.
EA81 will drop in with relative ease. Some crossmember work, depending on trans choice. And steering clearance check. I would recommend using one for a quicker route to more acceptable 'Daily Driver' power.
EA82 needs trans crossmember and engine mount hole widening. The engine will technically fit, but the front frame rails will be 'uncomfortably' close. Hitting the accelerator hard can bash the plastic timing belt guard if the mounts are not perfect... Which they are not. EA82 trans is almost guaranteed to hit the steering rag joint. With that engine getting to the distributor is a pain around the brake master cylinder. If your particular Master cylinder has the lines aiming straight down, you will have to switch it to one with them aiming to the right.
Can't directly state as to the EJ, never done it. However you likely need most, if not all, of the mods required to run EA82, as they measure close in size.