Also, it's fun to talk about budget-build engines for power, but none of that matters ultimately without the rest of the powertrain holding it together.
You can have a 5.3 making big boot, but if you have a $250 T5 manual trans it's gonna grenade. Having a built T56 or more is going to be $2500 easily. :/
EDIT: LOL, just saw Tim's comment above. If I ever throw a V8 in my BMW E36, there's nobility in keeping the budget at 300-350hp and a T5 behind it for cheapness.