tti headers w/ Milodon 8 qt. oil pan

hemidreamer said
A friend had trouble fitting the pan on his Duster. Mine is a '68 cuda, rather than taking the chance I went with the stock pan with my TTI's.

I went stock also with no problems. My motor is over 400hp so I don't think I need extra oil for that.

What is a good determining factor to switch over to a larger oil pan like a 8qt model?