408, Small or Big Block? Need EGT Info

EGT 12.5 ish 15 spike
I researched this as I will be running nitrous which can quickly spike egt
Keep a close eye on timing

Thanks!!!! I think you may have understood what I was asking and why. I appreciate it. I need to know what normal is, or the range, so I will know if "IT" is too high, not my tune. I am making mods, not trying to tune the engine. If the mod makes it hotter, I can then adjust the carb, maybe retard a little timing, but if I don't know what normal is, how am I supposed to watch my timing? It would make sense that I could, with a good tune, see what it is without the mod, make them mod and see what it is, but if I don't know the normal range, and danger range, it wouldn't help.