1968 150 MPH discussion

I can only for sure say that all big blocks came with the rallye dash clusters and all three of mine have horizontal display numbers and push to fit speedo cable connections.
1-M-code , 1- Formula S, both auto and 1- 4 speed 383. 2 of them have the A-57 trim package.
I don’t think they made a 68 M code or a A57. This is just about 1968 Barracuda 150 Speedometer.