I installed a T5 in my 65. I used crossmember and clutch cable from Modern Driveline. I have no experience with, but hear good things about Mustang Steve too. Ron Morris also makes parts for this. I have thier adjustable motor mounts.

Its really not that difficult to do at all. You will probably have to shorten the driveshaft?

You can look at the FAQ page on both of their websites.