[2-jaffacake-tone]

stainless headers are good if you spend the money on very good quality ones. as cj said ported headers up to 350 i have seen very good resualts on ported headers(out of 94 sets i ported so far none come back lol)
def wrap them.(as long as you have no oil leaks)
the only draw back that oil can soke in, fires start.
not sure prices but ceramic coated very expensive!!!

if you do wrap them.
wrap them off the car is easier, soake the wrap in water keep it tight as you can.