10.2 : 1 compression 360 at sea level. Options?

Keep in mind: the cylinder pressures can vary simply due to cylinder distortion when the head bolts are installed and torqued, unless you had the cylinders done with torque plates in place. I had one 4 cylinder block have the #4 cylinder go .0035" out of round just by installing the 2 top bell housing bolts and torquing them to 25 psi....

And decks can slope front to rear....