Looking to get more from my stock Yamaha 70 TLRR which is on my Boston Whaler 15 ft Dauntless. I want to get to the beach 1st where as you guys want to get off the beach 1st. I'm and old racer that can't just leave things alone.

Model is "93" 70 TLRR that is pushing a 1000 lbs.
Upgrade to 90 hp carb's ? yes/no if yes is there a better vintage year
If i can use 90 hp carb's do i need an intake manifold also ?
If using 90 carb's what jetting would you start @500 ft sea level
Mill head ....what is min. cc ?
Reeds i will open up
Any mod's that can done to exhaust plate adapter?
I know there is high performance tuner but i don't know if this will work that well.
Looking for the spec sheet that is used for this engine if anybody has one.

Looking forward to all your ideas .