E58 400 plus HP Dart sport build

Yeah I'm trying to keep things as simple as possible. I do have a budget I go over it all stops and will sit unfinished for long time. I plan to keep balanced as externally balanced. If I start jerking with that many things have to be changed out and not in the budget to go crazy with that. I'm sure I'm ok so far with what I got basically a stock bottom end more compression. Once I know for sure hopefully the pistons fit the bill if not builder can help guide me right direction.
No problem keeping it external, I'm just saying you definitely should re-ballance it after you decide on pistons