25" Transom Actual Height

[Normagain]

Getting ready to do the transom on my 1974 20' as early as this week if I can get that far, will see! Google isn't very user friendly for numbers so anyone have an actual measurement of transom height for a 25" shaft outboard. I know it is at least 26" or might be closer to 27". Maybe to get the vent plate a bit above bottom I should go 27" anyhow? Going with a Suzuki DF140 if anyone has one they wouldn't mind measuring!