BM 98,
Remember the '60 Pontiacs used metal tubing on the throttle linkage, and not flexible cabling. And the left motor mount had no "safety" design if the rubber portion failed. And it failed too often. The result?
The failed mount will allow the left side of the engine to lift off the mount/frame with very little acceleration input. The metal throttle linkage is designed such that as the left side of the engine lifts, it causes the throttle inkage to pull the carb throttle open! And then it becomes self controlling - as the engine makes more power, it lifts more and opens the throttle further!
Be sure and check the motor mounts carefully. Either replace them for any moderate driving, or install some sort of safety catch on the left mount, or engine, to prevent the engine from lifting off the mount if the rubber fails - especially if you plan to use the Pontiac torque regularly! This info is from direct experience!
Jim Hand
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