well my a12 i used to get vavle bounce alot and tried to kill it but never did very strong motors the Aseries.

but with a modded Aseries, depends on your motor is it rebuilt, fully balanced etc?? as this will help with how many Revs it will take relabily.

My a14 10;1 (full rebuild) with Gx head, elec dizzy, blueprint and balance and webers goes to 9000rpm . it has stock internals. How did i find that out i gave it a go at the optimal engine temp of coruse

i guess High reving is never safe. just stick to the revs where it is optimal to change to next gear (depends on ur cam) any further is just useless reving.