In 1949, all the Chevrolets got the first new styling after the war. The Deluxe was the brand new upper-end model for Chevy. The cheapest Deluxe was the Deluxe Styleline 6-passenger sedan, costing $1,492. Brakes were 11" drums. It has full instrumentation. The front suspension had stabilizers.
In 1950, not much had changed. The front leg room was 42.8 inches.
For 1951, there was little styling changes to the out side, though the dash was completely new. The radio was optional at $64. The rear axle had a ratio of 4.11:1. Wikipedia