You could try to enter each of the prospective tires in the search box and see what has appeared on LotusElan.net previously. Tires have been a popular topic, due to the decreasing availability of high performance rubber in the desired Elan sizes. But there is a considerable amount of discussion.
Rohan has mentoned that the Hoosier 185/60-13 is actually the diameter of a 185/50-13 tire, so it is quite small.
The tire companies have code words to outline the basic level of performance you can expect from a tire. Standard Touring is basically for sedans. High performance is not, at least in an Elan perspective. Look at the tread wear rating. Anything over 200 is going to be too hard and not offer the cornering you want (I hope), anyway. DOT treadwear of 60 may be useable for Elans, since the treadwear rating is based on the rated weight, and Elans are typically half that.
Difficult subject, good luck.
David
1968 36/7988