Well, it so happens my application is a 70 Roadrunner as well. Hemi, 4 spd, Dana, yada yada. Really wanted to wait for the Passon 5 speed. However, the SS 700 appears to be ready now. Don't want to cut "anything" though. Please keep us up to date regarding the install and your driving impressions. Can you bang the hell out of it and it still performs is the real question. Grabbing that extra gear on a long cruise and lope along is so worth the money but it has to stay together.