400 magnum distributor hold down is tight but not keeping distributor from moving while running

brian6pac said
Yea, as jack68gts said make sure its not bottoming out on the drive shaft, a 340 dist will fit in a 440 but will bottom out, the lengths are close. 340 is 3.875", a 400 is 3.500", a 440 is 4.000"

never mind was thinking it was a 440

Big block (ccw) and small block (cw) distributors rotate different directions.