HERE ARE THE DETAILS ON THE MOTOR AS PER OWNER / BUILDER: 425" stock ('79) block windsor (yes, I'm leaning on it!) built by Proline, 12:1 compression, high-ports, running on E100. I have an 82N pill in a big shot plate, 28N pill in the fogger. I grabbed the second system as soon as I let go of the 'brake and tried to drag the bumper, but it didn't hook79; quite hard enough on the 16's.