I'd weigh the cost of all those mods vs a used starion motor transplant. Can't match boosted performance
Pushes u back in the seat, while doing it quietly(as u like), plus geting decent mileage.
Folks still parting out starquests or doing LS, JZ, swaps etc
Balance shafts can wipe out a motor, but I'd never delete 'em IF the shafts & bearings look good
2nd order harmonics buzziness is annoying (to me at least)