robert....remember that your car is exactly as mine, so the experience i have with hedman is positive. No cutting flanges or anything like that. The #6 bolt access is no problem and using a regular open-end wrench for all bolts is all thats required. The trick to starting the center bolts is to thread them into the head, FIRST. THe hedman flange at #6 & #5 is drilled to fit over the bolt head and slotted to position the header in place. After that, its a piece of cake.
Also, use the FELPRO #1424 header gaskets and ARP stainless header bolts and you'll be set-up for an easy, no leak installation!
1973 SD455 T/A
1979 S.E. T/A
http://community.webshots.com/album/16587603rOyvmFCiHs