408, Small or Big Block? Need EGT Info

I got this off Google:

The absolute maximum safe EGT range is debatable. Our universal rule of thumb, regardless of engine make/model/year, is to not exceed 1250° F and not to operate in the 1200° F - 1250° F range for an extended period of time.

My EGT Stays pretty consistent. I understand there are a lot of variables that determine EGT, but I reason that they had to make an EGT for a reason, that reason I assumed was to prevent burning valves. This tells me that 1,200 is the danger range. If I start getting near 1,200 I will see what I can do to bring it down, but this is what I was looking for.