I'm in the process of putting a T5 behind a 351C in my '68 Mustang. Today, I was about to put the T5 bellhousing on and noticed that I had an 11" clutch, with the bigger flywheel (165-ish teeth, or something like that). I thought those were only for 351W's, but I guess I was wrong. Well, the T5 bellhousing won't even fit over the big flywheel, so I'm going to have to get a new clutch/flywheel before I go any further. I haven't taken the clutch back off yet, but when I do will I find the 50 oz. balancer? Or the 28 oz? Is the balancer matched to the engine, or the flywheel size? Also, since I have to get the 10.5" clutch and the smaller flywheel, will I also have to get the other size balancer to match? Or will mine work, whatever it is?