You could have the clutch linkage adjusted too tight. The noise could be the throwout bearing riding on the pressure plate fingers even when your foot is off clutch pedal. If the tranny output shaft is not hooked to driveshaft, it'll turn a little due to friction between tranny input shaft and pilot bushing, and maybe a little friction between disk and flywheel. The way I set the clutch in my 54 is to have about 1" of play in pedal before clutch linkage starts to work. I also spin TO bearing by hand to make sure its not jammed against pressure plate.

good luck

chip

Preaching the Hot Rod Gospel according to the 4-stroke apostles:

Suck, Squish, Fire and Fumes