Ahhhhh, a '72 fastback. That was my first car back in '78. I'm going to start singing "Memories" here in a minute...
A relatively modern pushrod in it, that'll be interesting.
Have you looked at Mustang360 and their '71 (I think) they are modernizing? Large Marge I think they call it. It's a notch, so not nearly as attractive as yours.
Got pictures? I would love to see them, mine was yellow.
We have a subforum for the classic years, '64-'73. Start a new thread there with your build. I'm betting the guys there would really dig it.
Post some pictures here first, I want to see your mustang.