Originally Posted by bullitt5897

The Mustangs do make good power but also have an extra 1.3L of displacement. That displacement goes a long way. The 4.5L stroker in N/A form easily breaks 4xxwhp...

You can do the following and should easily break 400rwhp:

4.0L stroker kit $3-5k
Bare short block (reuse your own)
Jun 282 cams (not sure on price $800?)
Built heads $2-3k
Custom intake manifold $2-3k
Stillen G3 intake $450
Z1headers $800
Test pipes $300
3" exhaust $1200
Lightened flywheel/clutch combo $1000
Fuel system to support the power $1000

Total cost $15k-$20k with labor

Note: you can run dry sump and gain a significant amount of HP but you will be paying north of $12k for it...