I'll hazard a guess that the compression is normal.
Is it originally Canadian market, maybe? You have injection yes?
You've verified a clear PCV system that breathes freely, also?
Check the flap valve in the air filter box. They get stuck to hot only air. Replace the air temp thermostat or remove the silver accordion hose or block the lower, inner hot air inlet after you ensure freely breathing into the air filter box. As you are in Alaska, maybe keep the aif filter box preheather control working by replacing the thermostat. Calorstat is OEM? iPd has em.
You can call the dealership, or other ways to check, whether the engine is original to your 1990 240.
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