Depends on who does the work and what they charge. A straight 3L swap with some minor mods to fit your stock stuff shouldn't be about $800 motor and about $800 labor for the fabbing. The labor could be off depending on who does it. Then you can do the other things like intake and exhaust later.
Almost everyone with a 3L swap with SVT intake/cams/fuel system are turning 190's-200 at the wheels. It comes out to 240-250 at the crank. Seems to me that 50 HP at the crank all the time and more reliable, fits better, etc. is worth more than 70 HP once in a while.
Former owner of '99 CSVT - Silver #222/2760
356/334 wHP/TQ at 10psi on pump gas!
See My Mods
'05 Volvo S40 Turbo 5 AWD with 6spd, Passion Red
'06 Mazda5 Touring, 5spd,MTX, Black