OK, FRAME RAIL ROT. Check the bottom of the front frame rails in the engine compartment. I had a 240Z around 74. and they rotted out on me and I had to get rid of the car. The inline 6 is a fast and strong motor. See what carb/carbs it has. I swapped out the singles for a holley 4 barrel. The thing really moved. They can be really nice once restored.