I have a '68 Cougar with a 351W and toploader. It's a streeter, not a racer. The clutch is beginning to get a little soft (I wonder why???) and it may need a flywheel replacement as well. Current replacement flywheels come with a diaphragm clutch bolt patterns. Well, when I was younger, it seems that there were NO problems finding a 164T/11" disc flywheel for a small block. Now, old, worn out units are sold for almost $200 plus shipping and resurfacing, if you can find one. I've seen people switch to a diaphragm clutch, but I have also read that "some bellhousing clearancing may be needed" for this conversion. I'm trying to avoid that if I can and the fewer modifications, the better. Any real world experiences with this conversion?