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What do I need to do to make it run 90 or more :
A lot more $$$$$$
Give us more info on what the setup is now, cause honestly, with 830hp, that thing should be going a lot faster than 80.
From my experience, and a lot of talking with the Jason at the afore mentioned Kunkel's Marine, don't waste your money on a -2 lower.
The Gold standard for a 283/300 was Bill and Monica's all white single 1500Hp twin turbo /#6 drive on a extension box. If I remember correctly he ran that boat to 115-117mph. You can find posts and pictures about that boat on this Forum. He now owns the only Checkmate 43 Punisher and sold the white boat(I think without the big power)
At 80mph I suspect you are 5... maybe 8mph short of what your boat is capable of with 830hp. I don't know if you need setback or a short drive or a different prop. But as has been suggested Kunkels Marine has done a lot of rigging for speed and testing on the 283/300. If they can't get more out of what you have, then you need more HP.
Hope you find success.
This is an old thread and the OP has likely moved on.
That said, he did indicate 6 psi of boost, he could possibly turn it up if it is more HP that he needs and to get another 10mph. He probably needs some set up adjustments and more HP to get all 10 mph.
80mph in your 270 is moving well with a 700 HP 540cid and it's a great looking boat as well. But you might find some speed still in it with the right set up too?