Here is a little back ground. Should be legal in a 62-63 car as there were two four inline 383's built both years. I looked up the carbs and they were afb's. No two four 383's in 1964.
In 1960, the factory altered the 383's bore and stroke to 4.25x3.38 inches, making it a low-block. According to Chrysler, the hottest 383 that year came with the famous 300J cylinder heads and a dual four-barrel inline carburetor setup that produced 343 hp at 5000 rpm. This rare engine was one of the most powerful 383's ever built. A more practical two-barrel 383 with a 10.0:1 compression ratio had 305 hp at 4600 rpm and 410 pounds-feet of torque at 2400 rpm.

There were three high-performance 383's to choose from in 1963. First was a single four-barrel unit with 10.0:1 compression that developed 330 hp at 4600 rpm. Torque was 425 pounds-feet at 2800 rpm. The next most powerful 383 had a slightly higher compression ratio of 10.10:1. With a four-barrel carburetor, it developed 360 hp at 4800 rpm and 470 pounds-feet of torque at 3200 rpm. The top-of-the-line 383 was the dual four-barrel version with compression lowered to 9.60:1. Nevertheless, it produced 390 hp at 4800 rpm and 485 pounds-feet of torque at 3600 rpm. The 305-h p two-barrel 383 was also available for more mundane chores. This year was the apex of 383-engine development, as research and development shifted to the larger-displacement engines.
I was thinking the two four barrel 318 had the wcfb's but the 383 had afb's.