If you buy the correct shocks, your problems are over.
If you don't want to buy new shocks, you still have options.
1. Cut out your coil bucket and fab new upper mounts. You'll have every inch of up-travel back if you do this right, maybe even an extra inch.
2. Remove all preload and run a helper spring. You'll have to properly limit your droop so that your coil doesn't bounce around. Full droop is possible, full up-travel is most likely not.