Restore 2nd partition as 1st main boot

Hi,

I've read a few issues restoring partitions, but they don't quite answer the question I have, so here goes.

I have an SSD, 256GB split up in 3 partitions, as follows:
1st: System Partition, 100MB
2nd: Windows 7, first OS installed which created the SP.
3rd: Windows 8, recently installed after I shrunk the 2nd partition.

I can backup and image each or all partitions as both OS's are operational via the Windows 8 boot menu.

My question is, how can I image the Windows 8 partition and restore it as the only active OS, using the entire SSD minus the SP?

Thanks in advance!