Found a 20hp Mercury for sale here in west cental Indiana at a garage sale. Average paint condition, no oil leaks, clean under the hood, starts and runs at idle, unable to lake test. Owner says it is a mid 70's price is $875, says he won't take any less. He doesn't know a lot about the motor as far as history, he bought it with a boat and upgraded to a 20hp 4 stroke. Any thoughts on value, or issues with this age of motor. Are parts still available. I'm looking for a dependable low maint. outboard for a 1448 Sea Nymph. Thanks, Todd