Stock torque converter and 009 injectors, I would say it would be a PT6131E or PT6131RE turbo.
Anymore than this turbo, and you would surely be out of injector. Actually, this turbo will make enough power to completely max out the 42.5# injectors.
Turbo is rated to support 590-600 flywheel hp.
Injectors will support 510 flywheel hp when maxed out. So honestly, you'd be about done at around 24-25psi of boost with 009 injectors.
In my opinion, I'd slap some 60# Mototrons and a TT chip and be done with it.
HTH
Patrick