I am running an 11 inch clutch behind my 261. It is tight. In fact when installing it the pressure plate rubs against the bell housing while you are tightening it up but once it is torqued down it works fine. I have put thousands of miles and a number of trips down the drag strip without a problem. I assume you must have the flywheel drilled for the 11 inch clutch and if so it should work fine.