Hello, Wow Dave, you really know you stuff!
My Nova is a 68 with a 454 from a 74? Motor mounts are in great shape with very low miles. However the factory rubber mounts still allow the engine to torque under heavy load. Last owner fixed this by using a cable bolted from the frame around the upper control arm shaft to a bolt on the head. Hard launch and the cable snapped the end off by the head, engine rocked and stuck at wide open like you said. Turned off with the key and nothing was damaged other than the end of the cable was snapped off. Have saw many big blocks with the engine chained or cabled and even the solid plate bolted across the front of the engine. Would solid motor mounts be better than the chain or cable or would it be better to have solid mounts and a cable? Would I need the Moroso solid mouns for the 68? Would it be smart to convert it to a cable throtle? If so is, What would need to be switched? Thanks, Dennis.