Manifold Replacement

[mattgic]

I developed an exhaust leak on the manifold. I am fortunate enough to have a new one available. So it is a complete replacement, intake and exhaust. The studs came out of the block on removal and the intake mounting bolts just sheard off.
I ordered some new studs, but it seems that the vendors sell brass nuts for the studs. Is this necessary being that this car is not a show car and very likely will never be one.
I shouldn't have any issues using grade 8 nuts for the studs and mounting bolts.