How much nitrous can stock 360 rods and cast crank take?

Depends on how good your tune-up is. Run it way lean or rich and they won't last long.

With a good tune-up 150 shouldn't be much of a problem.

As well as your rods and crank your pistons and ring package will be limiting factors.If you can apply the 150 max shot over stages/delayed timed you'll be better off.Make sure you apply timing retard when spraying.

I ran 150 shot for a season on a OLD 360 shortblock. Ran 150 shot for along time then put another 75HP to it when I went to a 727 from a low gear 904, had to get my et back. I was no tune up wizard and it lived and I later sold it.