Given how general the questions you ask are I think the answer is "more than you can afford".
Also I don't think anyone has included the masses of small things in their estimates. For example: new hose clamps, a thermo fan, radiator hoses, the odd part or sensor off the blacktop that was broken on the one you bought, a new water pump, relays/fuse box wiring, zip ties, heat shrink, dizzy relocation, trumpets/airbox+custom intake, all the bits which are farked on the car which you discover while swapping motors, etc, etc.