If your moving engine back I would, but moving engine forward leaves 2 holes to the rear of the engine. I'm very familiar with these mounts, and yes they are very durable and stout, but moving engine as you are leaves a weak spot right at those rear holes that were to be used for the first location.
See,,,if you were moving it back, the engine beams itself would act as a structure, but moving forward is definately not advisable because of the void it leaves in the rear holes. I've seen them break from doing exactly that.
Your choice though, I would save mount for future plane, and spend the $6 or so for new one. I've personally bought more then one mount because I wasn't satisfied with initial placement of engine. Cheap insurance for you at the price of a mount. Good luck