i'm trading my olds 88 for a set of pistoms for my new engine. i'm looking at either the manley platinum pistons, roughly $750, or the mahle power pack pistons ,roughly $680 a set. thats for pistons and rings. i'm looking for about 600 rwhp. are there any downsides to either of these i should know about before buying?? and would a -11cc dish or a -23cc dish be better?