You can use manual from insallation directory of Simatic. ( C:\Program Files\Siemens\Documentation\English ). Title is "STEP 7 - System and Standard Functions for S7-300 and S7-400". If you want to check which SFB or SFC supports some CPU - go online mode into progect screen, select S7 programs - Blocks and you'll see all SFC and SFB.
Or other way is to select CPU, right click with mouse go to PLC - Module information and there in one of existing tabs you'll see list with SFC and SFB...