Are Headers Worth It???

['70_402]

I posted this in engine board but i wanted to get some more responses..
I am thinking about putting headers on my 402 and was wondering if the pros outweighed the cons......i have heard that they create alot of heat which makes you loose power and that you can never get them to seal and they will leak all the time....i have also heard that you get some good headers and they will seal and give you tons of low end torque....is any of this true and are they worth the 450 dollars for the good ceramic coated ones????

Thanks

Rick