As far as value if your goal is a 100 point concourse car then don't do it, if you are looking for a nice looking nice driving car I don't think it will effect value much.
As far as should you do it, depends on what you want to use the car for, if it is pleasure driving and touring I don't see the point, if you want to compete in local autocrosses, track days, or get the maximum handling from your Healey then go for it.
As far as using the 72 spoke wires, I suppose the suggestion relates to the slightly wider tire you may be using with the slightly wider wheel, which may be more sensitive to camber adjustment. In theory a possibility, in practice I will defer to others as to whether that is an issue.