TTI Headers on a 340 in a 65 Dart

Has anyone used TTI headers in a 65 Dart using a 340 engine. Their ad says, if I understand it correctly, that I can keep the Power Steering. Anyone have any experience with this? Also, will there be room for a power brake booster with the TTIs as I did not see that mentioned on their site. I understand that I will need a mini starter....correct? Thought I would ask someone who has done this already....might save some time. Thanks ahead. Best. Old Dart 66