I have a TR-176 with 5.5" CMC jack plate and 115 hp engine and swing-under tongue. My old garage was 19'6" deep and if I tilted the engine almost all the way down, I could get straight into the garage with 1" to spare and still get the door closed (LOL). With your garage size, you might get a 186 without a jackplate in. As mentioned, whether you can tilt sideways or not depending on width will play a big part. Also, you better measure exactly what your length is before you buy or you might be sorry. What's the old saying...measure twice, fit once