Welcome, even though I'm a newbie myself, there's nothing like a big hearty WELCOME to a forum like CC.com. To help you with the different concerns of your 72 Challenger. I myself have been checking in as a guest for awhile, until I made the move. I also bought my Challenger a 70 model w/ a slant-6, 904, 8-3/4 (3:23 ). Early on in 1973 from a local Dodge dealership as a trade-in w/ 40k on the clock. Now has 562k on the clock. It was a d/d from '73 to 2005, when decided to retire it from daily road struggles. Welcome again and enjoy. Al