Need help with Doug's headers install '65 Barracuda !

Have my daughters V8 '65 BARRACUDA up on jack stands with transmission out and decided to install Doug's headers and need some input as to "What to watch out for" to help me before I get too deep in the wrong direction. Just a good overview would be great from someone who has been down this dark road ! LOL ! I have a good general idea but I know the details will kill you ! Car is auto, power steering with 340 torsion bars (Blue paint) . Any constructive input is welcome ! Thanks ! Tim