Flywheel and damper advise

So my 468 after 3 boats and 20 years has thrown in the towel. Going with a Scat 1/4" stroke rotating assembly, block is good.



My Fluidamper and flywheel are toast.



Damper was 8" and not sure which one to go with, choices are 6, 7 and 8"...using an Ati Super.



Flywheel is steel and externally balanced, new deal is internal and choices are steel or aluminum.



The old saying, you can screw up a hundred times but getting it right is a small window.



Lightweight runner with 15 gears, i kind of understand the whole burn the prop etc.



You guy's that have been there, done that are what i'm looking for.



Thanks

Flywheel and damper advise