Welcome, You'll have few regrets, Xpowers are SS Steel and will probably outlast the car?
As a Mark I you may need to check the rear springs as there are posts relating to their quality on this site. If you have a local MGR dealer it may be worth having an experienced inspection, there will be members who can guide you in the right direction. There does appear to be a few terminal issues you may need checked over, that's part of 260 ownership.
Great choice!!
Paul