/6 with headers???

Hey all. I am just getting into the /6 fun. I was going to do a 360 swap but now I'm not. I have a 71 Swinger with a 225/ that i am thinking of swaping in a super six set-up and putting headers on. I read that the exhaust manifold has the heat riser for the intake. So the question is for the 6'ers with headers.
-Do you have any issues with the way your car runs on the colder days?
-Do you need to let the car warm up longer?
-If you done the swap from cast to headers, are you glad that you swaped out?
Thanks all. Oh and I do go to the "other" site but I like this one much better.