you cna also have the block bored out to a 3.905 and use LS1 pistons, and an LS1 crank and have a 5.7, or use a 4in stroke crank and have a 383. A stock LS1 crank will hold 500+ HP and can be had pretty cheap, a 6.0L crank or 5.3 crank is the same stroke.