1MEANGTO

I have a 408 that I'm building. I have a 4.00 eagle crank a 2002 6.0 iron block scat 6.125 rods tsp stage 1.5 ls6 heads. I am trying to get to 13:1 compression is there a piston out there to accomplish this or do I need to special order them? This engine will be a E85 moter when its done. I have been looking for high compression lsx's but haven't seen many around here is there a reason that no one runs high compression on a ls1? Oh this will be a spray baby also.