I'm not planning on using the 915's mostly because I don't know much about the motor their on and I'm sure they would need rebuilt. I have a set of 452's that have been checked and surfaced they will need better springs but other than that they are ready to go.

The weight of the 73 Roadrunner is 3,525 lbs I don't know if that's with a big block or small block so I would guess at 3,800 lbs to be safe