The smallest currently available YS is the 70 which will be a bit of overkill as stated above. Get a Hyde mount for it to eliminate vibration issues.
Go the Central Hobbies website for the Hyde mount and descriptions of the two versions of the YS 70. My dad had an Astro Hog with a K&B .65
Sportster in it running a 12x6 and it had unlimited vertical. Good Luck, post some photos if you can.
-will