408, Small or Big Block? Need EGT Info

I have a 408, I've been told that the Small Block Category is the correct place for this post.

I have edited this original post because there was too much confusion as to what I am looking for with EGT readings. I understand that there are a lot of variables that affect the EGT "Normal" reading for each tuned motor.

I am trying to find out how hot is too hot for the EGT reading. What temperature do I need to make sure the reading stays under to know that I will not burn a valve.

Please do not tell me I cannot tune a motor with an EGT gauge. I am not trying to tune my motor, I am simply trying to find out what temp is not safe for the valves.

Thanks