M20 identification

[ADEN]

My m20b20 piston groove gaps are just out of specs smoked right after new rings.
Now thinking of upgrade so i found an old version of the m20 in the junk but couldn't know what it is above the oil pan is engine id number (see pic) above the oil tube writen 85 it has old style intake and it is injection not carb, could it be 85mm bore ? I havn't heard of 85mm m20 bore from factory, need help knowing which m20 is this?
Thanks guys

[ADEN]

Sorry guys seems i have less info for the identification and i will have to convence the shop owner to remove head to know displacment and if he agrees i will have to pay for head removal and new hg and a compensation $ (these guys think if buyers knew that an engine's head was removed no one will buy that engine, they even refuse to clean used engines lol).