T56 trans on a slant ?

The T5s in the fox V8 mustangs had a 335:1 first gear ratio. The fox 4 cyl mustangs had a 4:1 first gear ratio. There is also a "world class" T5 that had a 295:1 first gear. Just a heads up there are a lot of different types of T5s out there.
All same bolt pattern yeah ? Feel like I shouid find a 4cly one considering I'm putting it on a slant 6?