Nitrous on a 318.....how much will it take

Yeah, I've whacked a stock 318 with a 150 shot while running 6PSI of boost from a B&M 174 blower.
A 200 shot stalled the rotors as the serpentine belt slipped, resulting in zero PSI but the car still pulled hard from the N2O.
Head gaskets are the weakest link..... lol
Many runs on boost and spray, never broke due to N2O, excessive RPM's (8,000+) and hydrolock (head gasket) is what did me in.