Hi Chris.
I'm using an Edelbrock nitrous kit, it's relatively cheap, and the materials and harness are better quality than the others out there.
Since I had modified the intake for a 2BBL carb, I used a NOS 2BBL nitrous plate.
The most I have sprayed is a 75 shot , my engine, even though it has cast pistons I beefed it up a bit with ARP head studs, and con-rod bolts. Also an MSD ignition and an electric fuel pump with regulator.
Also take into account that the tune is the single most important thing when using a power adder, get the tune right and the car will fly, get it wrong and....well it could get ugly.
alex