i recently had a ZOOM clutch installed into my car (im lacking in the lift or paved driveway department) i had a shop that does a good amount of work on fbodies do it and its grabs and drives awesome, is it kinda of expected for an aftermarket clutch and a resurfaced flywheel to chatter a lil bit at low rpms in first gear? not a huge concern

 

Pretty normal on these cars. Grease helps minimize it, but a little chatter for a new clutch is normal.