Deciding not to sell my k20a3 dc2, instead I'm going to build my a3. I know the a3 gets hated on a lot but I want to keep the a3 block. I am putting a list together on everything I need to make 450hp and still be reliable as a daily. Here is what I have so far (already have all turbo pieces):

k20a2 cams - $250
k20a2 crank - $350
JE pistons 9.0:1 -$600
Eagle rods - $400
ARP head studs - $250
Supertech valve springs + retainers $400
660cc Injectors - $250
Walbro 255 - $250
Blockguard??
Anything else?

I'll try to keep the stock a3 gearbox as I have a Competition Clutch Stage 4 and lightened flywheel already as well as the k-tuned 5spd shifter box.

A few questions I have:
Will I have issues with oil temp?
Will this be safe to redline at 8500?
How much would it cost to sleeve my block?

General suggestions are also welcomed