Chevrolet : 1955 Chevy Bel Air 4 Door Sedan

1955 Chevy Bel-Air 4 door sedan, been working on it for 8 years on and off, lots of work done to it. new brakes and cylinders,new body mounts, Motor mounts, transmission mounts. New muffler and pipes, inner fenders sand blasted and re- painted, new screws at inner fender's seen in pic's, replaced rocker panel's both sides, chasis repainted, replaced floors. New floor braces front and back. Motor was rebuilt about 7 years ago hasn't been started until last month. Same with transmission has been sitting. Started car last month drove it a few miles. Motor and Transmission sounds like it's sat for years. Motor knocks.I HAVE TRUNK FLOOR METAL TO REPLACE . THANKS FOR LOOKING