[2000 Mustang G-Tee]

Alright, heres the deal....I have an extra sum of money left and i've been thinking about starting to mod my 2000 4.6L by dropping in a Big Block 509 or 528 Hemi or any other Big Block engine that would fit...How do i start looking for the right engine to drop in and what sizes would fit for that "little" extra amount of HP i'll gain...after i get some ideas i'll shop around for a Turbo and NOS kit along with exhaust, tranny etc etc.

Thanks