Well if you want to know first hand, i can tell you. i just finished my swap a few months ago, like you i couldnt part with my 99 v6 let alone afford a new gt payment or the insurance, so swaped it (sounds easy) took me a few months, lot hard work and time under the hood...but I DISAGREE with all these guys sayin "just buy a v8" because i spent a little over $2,000 on everything that includes the motor, t-45 trans (mine was auto) d/s, exhuast, computer, harness's brake booster, hydroboost lines and rack, pedals, and eveyrthing else that MM&FF left out (they really made the swap seem simple) but anyway my point is i have the only swaped 99+ around this area and people give me alot of credit for pullin it off, so make your own decision man, i'll help ya out a smuch as i can!
-Ryan