Kevin,
Per the 1997 registry, CSX 3201-CSX3299 came with 428 engines. CSX3101-CSX3200 had 427 engines. Then CSX3300-CSX3360 had 427 engines and I THINK these were the dual four barrels. This is per the last registry published and may not be correct as a lot of cars changed over the years.
Production figures for 427 style cars are given as below!
Street cars= 260
Prototype Competition Roadsters= 2
Production Competetion Roadsters= 19
Semi-Competition Roadsters= 31
Daytona Super Coupe= 1
Chassis only= 3
COB/COX cars=27
Bare stretched chassis (Paramount Film Cars)= 5
Coil Spring Total= 348
These numbers are not set in concrete and could be off as even the registry states they are approximations.
Ron