I live in Ohio and I have an 880 gas engine that is in excellent conditon and it has 3 and 3/4 inch flat top pistons and has 150 psi compression.  It is the complete engine and includes manifold, carb,and everything except the starter and generator.   It is in a tractor now and you can hear it run.   I am not really sure the exact price but I am thinking $1250.   Let me know what you think.  Terry