I wouldn't suggest fitting the clutch on mounts or poly bushes,
fitting it directly to the fly wheel will see you best results!
On a serious note, are you taking the whole engine and box out in one?
Or are you leaving the engine in?
Gear linkage bushes are easy to change and make for a more positive gear change
Engine mounts are available, ranging from powerflex to nismo, , if you taking the lot out you will be undoing all bushes anyway
2x gear box main mounts
1 x engine main mount
2x f + r stabilisers
all upgradable!!