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Make sure Transfer Slots in the carburetor are not over exposed. If they are then that has to be corrected.

Make sure pickup filter in gas tank is not plugged up

Yes my son in law had a 4 cyl T5 in his '87 mustang and took it out and put a rebuilt World Class T5 in there direct swap.

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.