Did a little more digging on factory 4bls. According to the Cars&Parts chevy casting ID book the WCFB's were used primarily on 283 manual trans cars, and the 4-jet on automatics. Both my early 283's were manual trans cars. I had a 57 pontiac with a 4-jet on a 347, it would be an excellent choice also. I haven't looked on e-bay for one of these for about 6 months. Then, rebuildable 4-jets were going anywhere from about $15.00 to $50.00 depending on application. Rebuilts were as high as $500.00 if the application was rare and the ID tag was included.
One thing we are assuming is your intake is for this early carb. If you measure from the center of one front carb bolt to the other, and the distance is approx 4 1/4" either the 4-jet or the WCFB will work. If the center to center distance is 5 1/4" you would need a standard flange holley or carter afb / edelbrock. Kits for the early carbs are readily available. Hope this helps.
John
