1.
New 4g63 springs
New retainers

No. Get Crower springs and Retainers.

2
Crank scraper is good, but get the Windage tray and baffles as well, Esp if doing auto cross. Its cheap insurance you have oil control. Also look into the Oil restrictor.

3. 9.0 CR pistons are custom, they will not be an off the shelf item.

4.Yes MS is going to be important for you when you boost.

Over building isnt possible, i call it, buidling in headroom/insurance.. Im only running 9 psi on my Built motor and Head.. The only thing holding me back, is turning up the boost.

And traction lol runing low 9's in the 1/8th with .4 reaction times and no traction in 1st lol. Launch needs work , but still trapping 83+Mph. Not bad for shit launch and 9 psi.. With that trap speed i should be into the high 8's if i can hook and launch..

With that goal, id get some 700 range cc injectors, that way you have a good anmount of head room. But dont get them till you figure out your MS config. Might as well do forged pistons and rods... Build it right up front so when you do want to try something else.. your ready, you dont have to re invest in machine work etc..

you can always trust a dishonest man to be dishonest, honestly, its the honest ones you need to look out for. you never know when they will do something..stupid