At what HP /rpm level are billet main caps and or stud girdle needed?

At what level of hp/RPM are billet main caps and or stud girdles needed? How much power/RPM will stock caps with studs handle?
512 stroker 400 block
trickflow 240's
H beam scat rods
440 source 24cc dished pistons
Ohio forged crank
10.4:1
cam chioce not made yet
Mostly street driven 69 barracuda. Occasionally taken to the strip.
Thank you.