I haven't run new tires in years. I've been swapping on used tires a lot lately, but always a soft compound street tire (falken azenis, kumho mx, bridgestone re71). In general, the inner shoulder will be worn to give a very square edge, but the camber seems to put the wear across about 1/3 of the tread. I got much faster inner edge wear from 3/4° toe-out. Tires that only had about 3/32nd tread went to cord on the inner edges in just a couple months.

Toe-out + highway driving will give rapid inner edge wear. Negative camber will balance out the wear across the tread if you drive it hard and usually chew the outter shoulder.

-2.1 kept my Hoosiers from cording the outside edges during autocross last season. That much camber also adds a lot of front grip, and that's what a 240 tends to lack.
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Parting out '84 DL auto, many cheap parts available