Header clearance

Hey guys, Quick question.

Im in the process of purchasing some 3-into-1 headers for my '72 Dart with Power brakes from a guy on the site here.


Ive read around on the internet of some people having clearance problems with the Power Brake booster, is there any truth to this?

Heres a link to the ad, has a few pictures in it: http://www.forabodiesonly.com/mopar/showthread.php?t=208978

Thank you in advance for your help

-John