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Sounds like all stock parts.
Theres nothing really we can do for you in this regard. He's 100% right when he says to get it on a Dyno to see for sure.
If I had to guess, probably 6-7k safely
my brother in law is running b20/vtec swap and hes reving up to 9200rpm's. running stock internals with a gsr head on it. i dont see why you shouldnt be able to do that safely.
I dont believe that!! 6-7 I always thought it was capable of 8-9 easily
it seems to make plenty of power ALL the way up to 9000rpm's. the shop that got the bottom and top end for him said he CAN rev up that high no problem. they even have his engine under warranty and they sold him the ecu that lets him rev up that high. the shop said "yes you start getting into those higher rpm's you are risking grenading the motor but i wouldnt worry to much about it until 9500rpm's and once you replace LMA's with type R's LMA's and upgrade the valve train you can go up to 10,000rpm's. you are still in risk of grenading the engine but no matter what you do reving that high your risking grenading the engine" but like i said they have his engine under warranty KNOWING he can rev to 9,200 RPM's.