Considering the mileage your block will need to be honed at minimum. Odds are you dont have stroke length scratches or anything like that to warrant a bore but... you will have ovaling of the bores.
As far as the bottom end goes, there isnt any real reason to get rid of your crank and rods... unless you intend to rev it even higher upon rebuild. Again thats not even a must. My a3 is still pluggin away hard every day and currently at 8200rpm...
If i were you i would source a k24a1 head to replace your a3 head. It will allow you to run whatever piston you want (the a3 head limits you because of combustion chamber shape) and since youll need to hone/bore the sleeves you can choose whatever piston you want. A bonus is the added flow of the k24a1 head over the a3 head that will really shine once you put the setup together. Not to mention you can retain the valvetrain you currently have.
Oil squirters arent really needed. 8500rpm all day every day? Yeah. If youre replacing the stock pistons with OS pistons, just scoop some Supertechs with your CR of choice and have them coated. Job done, and done right.
You see people bag on the a3 all the time. IMO the head casting is a waste of aluminum. The rest is completely usable, and easy to mod inexpensively.
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