Pretty much spot on..
Trying to do a "Budget" rebuild any more is a real challenge.

I am trying to build a 406 Small block Chevy for the snow cat....

Used Vortec heads in great shape (Zero cash outlay....Sold the short block to recover the total cost)
400 block $150 plus $350 for machine work
Pistons....New ebay score for $135
Good used stock crank.....$125
Still need the cam/lifters
Timing gear/chain
Gaskets
Oil pump
Fuel pump
Push rods
Have new high capacity pan $175
Flex plate

And on it goes.
Have a fresh carburetor $127
New exhaust manifolds $175 pair

Intake manifold for Vortec heads to fit 4 barrel carb.....$100 plus

No matter what it is....even when you do all the wrenching yourself.....$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$ $$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$

Adds up quick