If i good remembert, run the daemon with
-rescan or
-checkblock=0.
this prints the blocks data to debug.log file.
you can read the block id. you need to change this too:
static const CCheckpointData data = {
&mapCheckpoints,
1383887110, // * UNIX timestamp of last checkpoint block
2179203, // * total number of transactions between genesis and last checkpoint
// (the tx=... number in the SetBestChain debug.log lines)
8000.0 // * estimated number of transactions per day after checkpoint
};