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Yes, the block should work. Both are 302 HO roller blocks so that shouldn't be a problem. If you are considering using more of the engine there are a few things to consider.
86 302's use E6XX heads and Mountaineers come with GT40 heads. So if you are dropping the whole long block in expect to have significantly less power. The top end (intakes) of the motor also won't have all the same provisions for sensors and emissions.
What else can I help you with?
Is a 1986 Chevy 350 engine block the same as a 1996 350 vortec engine block?
no
When did Tadeusz Piotrowski - mountaineer - die?
Tadeusz Piotrowski - mountaineer - died in 1986.
Where is the alternator located on a 1986 Mercury Cougar?
front of engine at top on right side facing engine
What is the stock engine in a 1986 Chevy Silverado?
probably a 350 small block
Where is a oil filter on a 1986 Honda Accord?
Screwed onto the engine block.
How many fuel filters are on a 1986 mercury cougar 3.8 liter engine?
one
What is the spark plug gap for a 1986 454 big block Chevrolet engine?
.045
Where is the thermostat located on a 1986 Toyota Corolla?
Is on the engine block on the upper water hose.
Where is the coolant engine temperature sensor located in a 1986 Chevy Van 305 cubic inch engine?
drivers side of engine block
Where is starter on 1986 Mercury Topaz?
open the hood, look down between the rad. and the engine. There it is.
Where does the carburetor hook in to 1986 Honda dirt bike?
it hooks on to the engine block and atteaches to the gas line
Where is the oil temperature sensor located on a 1986 Corvette?
Right above the oil filter , in the engine block.
