To clarify, how is the SAN LUN configured?
Are there 2, 2TB volumes on the SAN which have been spanned?
In principal, all you need to use the VMware Converter for is the OS (Windows, C:\)
Better yet, build a fresh windows, configure the iSCSI Initiator and connect your volumes as they are now. SHould be quick because the actual share stays right where it is on the SAN!
Also, use GPT to make disks larger than 2 TB on a sincle LUN.