I have a newer 258 in my 79 and the motor mounts are identical. In fact I just replaced them with Prothane mounts I purchased from Collins Bros, they were about $65 and I highly recommend them. They keep the engine in place. If you go with the Prothane mounts there is a plate that extends past the rubber mount, that plate points down. This information will be useful if your mounts come without directions like mine did.