In addition to my " junk yard rebuild" , a " routine overhaul " would consist of :

New pistons.

A rebored block or new liners as applicable.

Resurface the block deck , maybe line hone the main bearing bores.

Reconditioned connecting rods, ( rebushed piston end / resized crank end )

Reground crank.

Valve guides / valves / valve seats replaced to get clearances to factory new.

New hydraulic lash adjusters.

Cam / crank sprockets if they show any wear.

New oil pump.

New water pump

All of this adds $.

I've rebuilt / repaired countless engines over the years to varying levels of quality. Future use of the engine dictates how far one goes in a repair / rebuild. A car that only has 50 K more miles / 5 years of life left does not need a factory fresh rebuild. The only exception in this case is if someone has a second car that will receive the rebuilt engine once the first car rusts away.