A std 205 block is 380bhp rated a 200 block is 500bhp rated the RS500 is 800bhp rated...all FLEX rated.

Basically if you are running 4X4 you NEED a 200 block as the grip increases the twist...on a 2wd a 205 is safe to any bhp as over 400 you aint gonna grip LOL unless you obviously spend a lot of cash modifying the back end and in that case you are loaded...ROFL.