Ok so I just bought a 1967 m715 and now I need to get it running. It’s been sitting in a driveway for a couple years and it probably hasn’t run in at least 10. The brakes go to the floor with no resistance and I’m unsure if the engine is seized. Was thinking of starting by spraying lubricant in the cylinders and letting it set for a few days to get engine ready to start. Any tips here? Any thoughts on the brakes?