I tried to install the Chevy Duty, clutch fork boot, part # 90-525 and it wouldn't go on. Had the tranny out, clutch and arm out and flywheel out of my 235, so there was plenty of room to work. The boot looks like it is too big. They list the same one to fit 1947-1972. It's the rubber boot where clutch fork enters bellhousing. Has anyone else had this problem or am I doing something wrong.