*******STAY AWAY FROM DEALERS********

You can generally get an idea of what the compression values of any motor should be by multiplying its compression ratio (ours is a bout 9.3:1 IIRC) by standard atmospheric pressure (14.7 PSI), so 9.3 x 14.7 =~135 PSI (misprint in manual???) maximum, anything within about 20% of that would be acceptable (ie ~110 PSI), generally grouped within 10% of each other.

The 85 PSI you are getting may be related to leaks all across the head/gasket/block.

Take it to a proper engine re-conditioner rather than any dealer (not known as a "Stealership" for nothing, they will bleed you dry for even lifting a spanner. They don't want your business, they only want your money). The re-conditioners have the real knowledge and will point you in the right direction as to what NEEDS to be fixed, rather than aimlessly replacing everything in sight (dealership method).