You may have misread the title. I wasn't quite looking for somebody to bag on the 318, but if you do happen to have an extra 340 knocking around that you'd not mind parting with...
I'll second that JeremyAB95! Not all of us have extra engines sitting around but just might have a good running mildly built 318 already in their car. Which is exactly my case too... I've got a 904 that will need rebuilding as well, If I ever go to a 360 or a 340 (when the opportunity arises) I'll still use the 904.