Have you done a cylinder leakdown test, where the crankshaft is locked and air pressure is put into the cylinder through the spark plug hole? That allows you to listen at the carburetor, the tailpipe, and the crankcase to see where the pressure loss is coming from. You can also find a leaky head gasket by looking for bubbles in the radiator.
Until you have 100 miles or more on the engine under normal driving conditions, and at least 10 accelerations in high gear from 30 to 50 MPH, you're probably not going to see the kind of numbers you're looking for, and looking for 130 pounds of pressure on a compression test is a pipe dream.
Jerry
