I have an 87 legend 4 dr with a 2.5 liter motor that has a blown head gasket. I found another engine but want to know if it is interchangeable. the motor that i found in a 2.7 liter out of a 90 legend coupe. Will the 90 2.7 liter engine work in place of the 2.5 literwith out changimg the ECU? please help.

Davis