not running
 

Hi , Bought a 1996 miata not running. Has spark, is in time. No compression. Did a leak down test, every cylinder is leaking out thru the intake and the other spark plug holes and who knows where else. applied 100 psi for the leak down test , every cylinder won't hold more then 10 to 15 lbs. Previous owner said it just died driving down the road. 1st question is what is common to all cylinders. When i got it home and started looking at it the oil look new & it had no anti freeze in the radiator. just trying to decide if I should put the top end or yank out the motor?
Thanks