The 265 will also have the old style Lanova head with the bigger bodied injectors and the energy cells on the intake side of the head. Those intakes had "Oliver Diesel" written on the side.
There is no way to tell a 283 from a 310 without tearing it apart. My guess would be look at the water pump, where the fan bolts on. The 310s had a longer shaft so the fan would be up into the shroud, but a water pump from a 283 would bolt on as well and would probably need to be if it's in an 88.
Some differences between the 310 and 283 are that the 283 has 9/16" head bolts and the 310 has 5/8". The valves on the 310 head are also bigger, in addition to the extra 3/8" of stroke on the crank. But like I said, you can't tell those differences without doing some wrenching.
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