Tire wear, what's causing this! ? ?

Almost the only way to fit a 440 into that 68 on a 318 K is with the Schumacher mounts.
There are AFAIK, only 2 OEM bigblock A-body Ks; The early biscuit mount (67 to 72), and the later spool mount (73 to 75). Other A-body Ks can be used, either with the Schumacher brackets or home-builts. The early Ks in 340 cars were also offered with reinforced LCA pin mounts. These had a large thick washer welded on for ID just under where the crank pulley resides.The 67 K is not usually considered because of the way the idler arm mounts with a single-shear mounting tab. 68 up are double-shear.
-I suppose its possible to attempt to install a B-body centerlink into an A-body. That would definitely mess things up.The correct C-link will put your arms pointing straight back,parallel to the vehicle centerline.
-The Charger K was designed for the wider B engine bay. Ive never tried to swap it into an A. I imagine its a couple of inches too wide.