I know guys that can break an anvil with a ballpeen. My primary power adder is light weight, the car will have to have balast added to make EM minimum weight. I like the looks of the "New" Boss block but the added strength would have to add weight which narrows the weight gap between the 5.0 & 5.7. In addition it adds nearly 2k to the build cost. I bought a fresh 5.7 from a wrecked F150 for $150 that, with a cam change, will be run as bought and a roller core (broken piston?) for $125 which will have a stroker crank and pistons added. The reality, other than bragging rights, at less than 1800 lb and over 500 hp the amount of time that you are on it will be limited.
http://forums.corner-carvers.com/showthread.php?t=27451