Be sure and stick the tranny into the bellhousing with the fly wheel,TOB, pilot bushing and clutch in place to see how much you need to trim-You may get lucky and not need to trim anything!
As far as the ratios in any particular t-5 go, the main numbers are the three that come after '1352'- in your case its the 065, if that is the number from the aluminum tag or green and white sticker.
According to the decoder I looked at, your t-5 came from an 84 mustang/capri with 5.0 v-8. If that is true, it probably won't bolt to your bellhousing. Count the splines on the input shaft- that ought to give you an idea if you've got a chevy.
here's a site that shows the application- there are others that show the gear ratio.
http://www.5speeds.com/t5/index.html
