I have a 89 300e and it has lower comp on one cylinder so im going to pull motor and replace it with one from a 87 300e. will it be the same motor or will I have to change things. they are both the 6 cyl. anyone needing parts for a 300 e I will have most of the rest of the parts car except front and left sheetmetal, front left hit,good doors interior etc. thanks.