I didnt see your list # with the C but here are the ones that I found that were close. They Are all be the same


LIST # CFM STOCK JETTING POWER VALVE TYPE
1850-2 600 (F)66,(R)plate 134-9 6.5 4160
1850-3 600 (F)66,(R)plate 134-9 6.5 4160
1850-4 600 (F)66,(R)plate 134-9 6.5 4160
There is some good info At the mortec site and holleys page as well.


http://www.mortec.com/carbs.htm