NOS - Please help!!!

[V8Mustang]

Here are a few things:

1. Everyone has an opinion on the best kit but we like Nitrous Express - kits are safer than many and engineered very well.
2. You can get more shot than your car can handle. Most kits will go up to 150 but we recommend staying at 100 (you can go higher but will need to add a timing adjuster to retard your timing and will want to add cooler spark plugs).
3. With a 100 shot, if you want to be conservative, you could go with a timing adjuster and retard the timing 2 degrees from factory (NX says this is not necessary but just in case).

BTW, your gearing is perfect for nitrous - 4.10s are generally a bit much.