Coolant is very hard on engine bearings (crankshaft and camshaft) so kudos to for changing the engine oil afterwards.
New lifters (non-roller) have a convex surface on them. A person can take a new (or good) lifter end and it will rock against long flat side. If top is flat or concave, then both camshaft and lifter is bad.
The camshaft lobes have a slight tilt to them, as shown above. That tilt along with the convex lifter end will make the lifters (and push rod) rotate when engine is rotating for minimum wear.
Roller lifters/camshafts do not have this lobe tilt to them. Using a roller lifter on a tilted cam or non-roller lifters on a roller cam will damage
both in no time.
That said, sometimes there can be a bit of varnish buildup on top or bottom of lifter side. Those take a bit more to extract.
If parts were not going to be reused, taking a screwdriver or small pry bar underneath the block hole and pushing up can get one out – but that has a strong likelihood of damaging the camshaft. I’ve seen someone take a scrap piece of wood and work the way to cam lobe and lifter and rotating the camshaft (or engine) will get it past the varnish buildup. There are also a dedicated lifter tool to get one out – but finding one might be difficult.
BudW