Can you do everything yourself? Are you good at building cars?
Well, if I were you, I would really concider those facts. Its not cheap to let someone to do the project for you.
But if you know what are you doing, then its simple.
Damn, 5.500$...I would find a m119 5.0 bore and stroke it to 6.0 liters and add supercharger for the price like that..the bill gets a bit bigger, lets say 8000$-10000$ but then we would talk about 800+hp....afcourse, i would do everything myself tought...and if i wouldnt want so many horses, then a good condition m119 will do the job very well on a C-merc..